deps: update googleapis/java-cloud-bom digest to 51f57f2

Author: renovate-bot

.github/workflows/ci.yaml

@@ -331,7 +331,7 @@ jobs:
       run: |
         mvn install -B -ntp -DskipTests -Dclirr.skip -Dcheckstyle.skip
     - name: Validate gapic-generator-java-bom
-      uses: googleapis/java-cloud-bom/tests/validate-bom@47ad868794c5d38ee7eb95d69371a7a79f84d890
+      uses: googleapis/java-cloud-bom/tests/validate-bom@51f57f2a11e343bd935a75c946fe7461fdba36fd
       with:
         bom-path: gapic-generator-java-bom/pom.xml