#825: Allow passing explicit connection to pubsub API methods

🤖 I have created a release \*beep\* \*boop\*
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### [0.45.1](https://www.github.com/googleapis/gapic-generator-python/compare/v0.45.0...v0.45.1) (2021-05-04)


### Bug Fixes

* add async client to %name_%version/__init__.py ([#859](https://www.github.com/googleapis/gapic-generator-python/issues/859)) ([391fdb8](https://www.github.com/googleapis/gapic-generator-python/commit/391fdb84b13c5628c21d81ad311c689da8971f6a))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Follow up to #859

Closes #815

Also delete a stray } in feature_fragments which was resulting in almost empty files getting generated in clients. https://github.com/googleapis/googleapis-gen/blob/master/google/appengine/v1/google-cloud-appengine-v1-py/examples/feature_fragments

…y38/py39 (#859)

* fix: remove call to importlib.metadata.packages_distributions() for py38/py39

* cover

* update comment

PR created by the Librarian CLI to initialize a release. Merging this PR
will auto trigger a release.

Librarian Version: v1.0.1
Language Image:
us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:c8612d3fffb3f6a32353b2d1abd16b61e87811866f7ec9d65b59b02eb452a620
<details><summary>google-api-core: 2.29.0</summary>

##
[2.29.0](googleapis/python-api-core@v2.28.1...v2.29.0)
(2026-01-08)

### Features

* make parse_version_to_tuple public (#864)
([c969186f](googleapis/python-api-core@c969186f))

* Auto enable mTLS when supported certificates are detected (#869)
([f8bf6f96](googleapis/python-api-core@f8bf6f96))

### Bug Fixes

* remove call to importlib.metadata.packages_distributions() for
py38/py39 (#859)
([628003e2](googleapis/python-api-core@628003e2))

* Log version check errors (#858)
([6493118c](googleapis/python-api-core@6493118c))

* flaky tests due to imprecision in floating point calculation and
performance test setup (#865)
([93404080](googleapis/python-api-core@93404080))

* closes tailing streams in bidi classes. (#851)
([c97b3a00](googleapis/python-api-core@c97b3a00))

</details>

The backend API has a timeout of 4 minutes, so the default of 2 minutes was not
allowing for any retries to happen in some cases.

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-bigquery/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)

Fixes #853  🦕

Source-Link: googleapis/synthtool@d895aec
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:98f3afd11308259de6e828e37376d18867fd321aba07826e29e4f8d9cab56bad

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>