prototype: generator update preview

[jskeet]

This PR is intended to demonstrate the results from updating librarian to use gapic-generator 1.31.0, so they can be reviewed before we're actually ready to make the change.

The first commit consists of handwritten changes to the post-processor string replacement scripts. The second commit is the result of running librarian generate --all when using gapic-generator 1.31.0.

[gemini-code-assist]

Code Review

This pull request updates dependency versions (e.g., google-api-core, grpcio) across librarian configuration files, removes multiple testing/constraints-3.9.txt references, and updates copyright years to 2026 for the google-ads-admanager package. Additionally, Python version support checks in admanager_v1/init.py are updated to target Python 3.10. Review feedback identifies a critical NameError in admanager_v1/init.py caused by the removal of a necessary sys import and raises concerns about unpinning dependencies in storage-integration.yaml, which may lead to non-deterministic CI behavior.

[gemini-code-assist]

The import sys statement was removed from this block, but sys is still accessed on lines 503 and 505 (e.g., sys.version and sys.version_info). If sys is not imported globally, this will cause a NameError at runtime when the fallback path is executed. Given that import warnings is performed locally within this block, import sys should also be included to ensure the block is self-contained and functional. Additionally, if this change updates the minimum supported Python version, ensure the project's metadata in setup.py or pyproject.toml is also updated to reflect the same minimum version.

Suggested change

	import warnings
	_py_version_str = sys.version.split()[0]
	import sys
	import warnings
	_py_version_str = sys.version.split()[0]

References

1. When updating the minimum supported Python version in runtime checks (e.g., 'sys.version_info' checks), ensure that the project's metadata in 'setup.py' or 'pyproject.toml' is also updated to reflect the same minimum version in 'python_requires' and Trove classifiers.

[gemini-code-assist]

The replacement for constraints-3.10.txt removes version pins for several dependencies (e.g., google-auth, google-api-core, grpcio). Constraints files are typically intended to pin specific versions to ensure reproducible test environments. Removing these pins may lead to non-deterministic behavior in CI if newer, incompatible versions are released. Please confirm if unpinning these dependencies is intentional.