GitHub Actions fix (#138)

* Made workflows use caching and artifact upload v4 instead of v3

* Changed artifact names to support matrix builds

Author: MattysLouw

.github/workflows/maven.yml

@@ -19,15 +19,15 @@ jobs:
       with:
         distribution: 'temurin'
         java-version: ${{ matrix.java }}
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
         restore-keys: |
           ${{ runner.os }}-maven-
     - run: java -version && mvn --version
     - run: mvn --activate-profiles dist --no-transfer-progress package
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
-        name: BungeeCord
+        name: BungeeCord-Java-${{ matrix.java }}
         path: bootstrap/target/BungeeCord.jar