deps: update googleapis/java-cloud-bom digest to db4265f (#2755)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| googleapis/java-cloud-bom | action | digest | `f3c611a` -> `db4265f` |

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.github/workflows/ci.yaml

@@ -327,7 +327,7 @@ 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@f3c611a09b556e81029d5588afe22ca6a15b0cef
+      uses: googleapis/java-cloud-bom/tests/validate-bom@db4265ffa7e23c64ae37d9804394569e4577b3e2
       with:
         bom-path: gapic-generator-java-bom/pom.xml