Bump announcement sub-job to use setup-gradle v4

Author: robotgryphon

.github/workflows/_announce-latest-nightly.yml

@@ -32,8 +32,11 @@ jobs:
           java-version: 17
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v3
+        uses: gradle/actions/setup-gradle@v4
 
+      - name: Init Gradle
+        run: ./gradlew fgInitCM
+        
       - name: MC Version
         id: minecraft
         run: ./gradlew mcVersion -q >> "$GITHUB_OUTPUT"