deps: update googleapis/java-cloud-bom digest to 789590d

Author: renovate-bot

.github/workflows/ci.yaml

@@ -330,7 +330,7 @@ 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@6626f91d2ea122ba19d15e33c8a6bc21aebe5177
+      uses: googleapis/java-cloud-bom/tests/validate-bom@789590db1f567cd7541bc2e74c96e0174e8f1239
       with:
         bom-path: gapic-generator-java-bom/pom.xml