deps: update googleapis/java-cloud-bom digest to 780736c

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@47c5dbc0b2c9a7d120cc12eb3650db89ab5b894f
+      uses: googleapis/java-cloud-bom/tests/validate-bom@780736c2b35f8f657b686bd1f4e61946835736ec
       with:
         bom-path: gapic-generator-java-bom/pom.xml