Update gradle-build.yml / gradle-build-action

This hopefully improves the issue with builds failing with an OOME, which might be related to gradle/gradle#23215, which could be solved with gradle 8.3 (used by the new gradle-build-action according to gradle/gradle-build-action@v2.7.1...v2.8.0).

(cherry picked from commit a7c4161)

.github/workflows/gradle-build.yml

@@ -32,7 +32,7 @@ jobs:
     - name: Validate gradle wrapper
       uses: gradle/wrapper-validation-action@v1
     - name: Build
-      uses: gradle/gradle-build-action@v2.7.1
+      uses: gradle/gradle-build-action@v2.8.0
       with:
         arguments: build -Porg.gradle.jvmargs=-Xmx2048m
 
@@ -49,7 +49,7 @@ jobs:
           distribution: 'temurin'
           cache: 'gradle'
       - name: Publish
-        uses: gradle/gradle-build-action@v2.7.1
+        uses: gradle/gradle-build-action@v2.8.0
         env:
           # variables used by build.gradle.kts for signing / publishing (without 'ORG_GRADLE_PROJECT_' prefix)
           ORG_GRADLE_PROJECT_signingKeyId: ${{ secrets.OSSRH_GPG_SECRET_KEY_ID }}