Update build-and-test.yaml to use upload-artifact v4

As of January 30th, 2025, GitHub actions will no longer be able to use v3 of upload-artifact. If this update is not made, our build-and-test action will fail.

Author: RitzKid76

.github/workflows/build-and-test.yaml

@@ -36,7 +36,7 @@ jobs:
           mvn clean install
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: WorldGuard
-          path: target/*.jar
+          path: target/*.jar