ci: version-check to run only for release-please PR (#632)
ci: version-check to run only for release-please PR (#632)

While updating multiple dependencies in the BOM, it's ok to have inconsistent versions. But we want to ensure the consistent versioning when we make a release of the BOM.

I copied the setting from https://github.com/googleapis/java-cloud-bom/blob/main/.github/workflows/full-convergence-check.yaml#L10
googleapis/java-shared-dependencies,googleapis/java-shared-dependencies,googleapis/java-shared-dependencies