build(release): search for rules_python in BCR PR query (#4238)

BCR pull request titles use the module name `rules_python` rather than
the GitHub repository path `bazel-contrib/rules_python`, causing the
search link posted by `promote` to return no results.

Update the BCR PR search query in the release promotion tool to match
`rules_python` in the title.
diff --git a/dev/release/promote.py b/dev/release/promote.py
index 874a347..0e19e96 100644
--- a/dev/release/promote.py
+++ b/dev/release/promote.py
@@ -184,9 +184,7 @@
         branch_url = f"{REPO_URL}/tree/{branch_name}"
         release_url = f"{REPO_URL}/releases/tag/{version}"
         bcr_entry_url = f"https://registry.bazel.build/modules/rules_python/{version}"
-        bcr_query = (
-            f'is:pr ("bazel-contrib/rules_python" in:title) ("@{version}" in:title)'
-        )
+        bcr_query = f'is:pr ("rules_python" in:title) ("@{version}" in:title)'
         bcr_search_url = f"https://github.com/bazelbuild/bazel-central-registry/pulls?q={urllib.parse.quote(bcr_query)}"
 
         if run_id := os.environ.get("GITHUB_RUN_ID"):
diff --git a/tests/tools/private/release/promote_test.py b/tests/tools/private/release/promote_test.py
index e1c737a..a2c57c0 100644
--- a/tests/tools/private/release/promote_test.py
+++ b/tests/tools/private/release/promote_test.py
@@ -49,7 +49,7 @@
         "Version **2.0.0** has been successfully generated and tagged on branch [`release/2.0`](https://github.com/bazel-contrib/rules_python/tree/release/2.0).\n\n"
         "- [Github Release 2.0.0](https://github.com/bazel-contrib/rules_python/releases/tag/2.0.0)\n"
         "- [BCR Entry 2.0.0](https://registry.bazel.build/modules/rules_python/2.0.0)\n"
-        "- [BCR PRs](https://github.com/bazelbuild/bazel-central-registry/pulls?q=is%3Apr%20%28%22bazel-contrib/rules_python%22%20in%3Atitle%29%20%28%22%402.0.0%22%20in%3Atitle%29)\n"
+        "- [BCR PRs](https://github.com/bazelbuild/bazel-central-registry/pulls?q=is%3Apr%20%28%22rules_python%22%20in%3Atitle%29%20%28%22%402.0.0%22%20in%3Atitle%29)\n"
         "- [Release workflow status](https://github.com/bazel-contrib/rules_python/actions/workflows/release_promote.yaml)"
     )
     assert mock_gh.issue_comments[issue_num] == [expected_comment]