Update gradle/gradle-build-action digest to 87a9a15

Author: renovate[bot]

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
           jdkFile: ${{ steps.download-java.outputs.jdkFile }}
 
       - name: Build & Test
-        uses: gradle/gradle-build-action@243af859f8ca30903d9d7f7936897ca0358ba691 # v2
+        uses: gradle/gradle-build-action@87a9a15658c426a54dd469d4fc7dc1a73ca9d4a6 # v2
         with:
           arguments: build --info
 
@@ -63,6 +63,6 @@ jobs:
 
       - name: Publish To Sonatype
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
-        uses: gradle/gradle-build-action@243af859f8ca30903d9d7f7936897ca0358ba691 # v2
+        uses: gradle/gradle-build-action@87a9a15658c426a54dd469d4fc7dc1a73ca9d4a6 # v2
         with:
           arguments: publishAllPublicationsToMavenCentral