Bump GH Actions versions for deprecations

Author: zachbr

.github/workflows/gradle.yml

@@ -8,16 +8,16 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-java@v3
+    - uses: actions/checkout@v4
+    - uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
         java-version: '11'
         cache: 'gradle'
     - name: Build with Gradle
       run: ./gradlew build --no-daemon
     - name: Upload build artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: dis4irc-jar
         path: build/libs/Dis4IRC-*.jar