Upgrade to flutter 1.20.2

pubspec.lock

@@ -1,27 +1,13 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.13"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.6.0"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.1"
+    version: "2.4.2"
   barcode_scan:
     dependency: "direct main"
     description:
@@ -36,6 +22,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
   charcode:
     dependency: transitive
     description:
@@ -43,13 +36,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.3"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.12"
+    version: "1.14.13"
   convert:
     dependency: transitive
     description:
@@ -71,6 +71,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.3"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   file:
     dependency: transitive
     description:
@@ -103,7 +110,7 @@ packages:
       name: flutter_platform_widgets
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.41.0"
+    version: "0.60.2"
   flutter_plugin_android_lifecycle:
     dependency: transitive
     description:
@@ -121,13 +128,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.12"
   intl:
     dependency: transitive
     description:
@@ -141,7 +141,7 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.6"
+    version: "0.12.8"
   meta:
     dependency: transitive
     description:
@@ -162,7 +162,7 @@ packages:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
+    version: "1.7.0"
   path_provider:
     dependency: "direct main"
     description:
@@ -191,13 +191,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.2"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.0"
   platform:
     dependency: transitive
     description:
@@ -247,13 +240,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.6.0"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -272,7 +258,7 @@ packages:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "1.9.5"
   stream_channel:
     dependency: transitive
     description:
@@ -300,21 +286,28 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.15"
+    version: "0.2.17"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
+    version: "1.2.0"
   url_launcher:
     dependency: "direct main"
     description:
       name: url_launcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.4.10"
+    version: "5.5.2"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.1+1"
   url_launcher_macos:
     dependency: transitive
     description:
@@ -328,14 +321,14 @@ packages:
       name: url_launcher_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "1.0.8"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.1+6"
+    version: "0.1.3+1"
   uuid:
     dependency: "direct main"
     description:
@@ -357,13 +350,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.0"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.6.1"
 sdks:
-  dart: ">=2.6.0 <3.0.0"
-  flutter: ">=1.17.0 <2.0.0"
+  dart: ">=2.9.0-14.0.dev <3.0.0"
+  flutter: ">=1.17.5 <2.0.0"

pubspec.yaml

@@ -23,13 +23,13 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^0.1.2
-  flutter_platform_widgets: ^0.41.0
+  flutter_platform_widgets: ^0.60.2
   path_provider: ^1.6.0
   file_picker: ^1.9.0
   barcode_scan: ^3.0.1
   uuid: ^2.0.4
   package_info: '>=0.4.1 <2.0.0'
-  url_launcher: ^5.4.10
+  url_launcher: ^5.5.2
   pull_to_refresh: ^1.6.0
 
 dev_dependencies: