deps: update googleapis/java-cloud-bom digest to 93740d5 (#3280)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| googleapis/java-cloud-bom | action | digest | `0cd97b7` -> `93740d5` |

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.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@0cd97b7151b36465390bd5e31d017ec015a4bae9
+      uses: googleapis/java-cloud-bom/tests/validate-bom@93740d54e9e5dc9b83972ab8209c239acb993f48
       with:
         bom-path: gapic-generator-java-bom/pom.xml