deps: update googleapis/java-cloud-bom digest to 59c776b (#2827)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| googleapis/java-cloud-bom | action | digest | `db4265f` -> `59c776b` |

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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@db4265ffa7e23c64ae37d9804394569e4577b3e2
+      uses: googleapis/java-cloud-bom/tests/validate-bom@59c776be18728bcdc53f868c497baf1f5039abb6
       with:
         bom-path: gapic-generator-java-bom/pom.xml