[CI-SKIP] Add `curl` requirement for building paper. (#4768)

* Add curl to contributing.md

* change semicolons and periods

Co-authored-by: Mariell <proximyst@proximyst.com>

CONTRIBUTING.md

@@ -63,7 +63,8 @@ you will most likely use this for WSL), `homebrew` (macOS / Linux), and more:
 - A Java 8 or later JDK (packages vary, use Google/DuckDuckGo/etc.).  
 If you need one, you can find them on [AdoptOpenJDK](https://adoptopenjdk.net/).
 - `maven` (often package `maven`; can be found on
-[Apache's site](https://maven.apache.org/download.cgi) too).
+[Apache's site](https://maven.apache.org/download.cgi) too);
+- `curl` (package `curl` everywhere).
 
 If you're on Windows, check
 [the section on WSL](#patching-and-building-is-really-slow-what-can-i-do).

scripts/requireDeps.sh

@@ -12,6 +12,7 @@ if [ -z "${1:-}" ]; then
     _is_dep_available git
     _is_dep_available patch
     _is_dep_available mvn
+    _is_dep_available curl
 
     # Ensure we don't have a JAVA_HOME set first.
     # Maven should work fine without the JAVA_HOME var as long as the JDK is on the PATH.