Fix release_bazel_module.yaml to set prerelease correctly.

Theoretically, I think this would've edit our release for -RCs from prerelease to release but we didn't hit this for v34.0-rc1 since the release was set to immutable.

PiperOrigin-RevId: 859735492

.github/workflows/release_bazel_module.yaml

diff --git a/.github/workflows/release_bazel_module.yaml b/.github/workflows/release_bazel_module.yaml
index 46571aa..ecb06c7 100644
--- a/.github/workflows/release_bazel_module.yaml
+++ b/.github/workflows/release_bazel_module.yaml
@@ -19,7 +19,7 @@
     uses: bazel-contrib/.github/.github/workflows/release_ruleset.yaml@v7.2.3
     with:
       release_files: protobuf-*.bazel.tar.gz
-      prerelease: false
+      prerelease: ${{ contains(inputs.tag_name, '-rc') }}
       tag_name: ${{ inputs.tag_name }}
       # The release was already created by Google-internal mechanism,
       # so there aren't any useful assertions to make here.