This PR updates the SHA for the librarian language image to match the
one
[here](https://github.com/googleapis/google-cloud-python/blob/2feb74032fd9c5cc7eaf6072ab03e9e8397bd434/.librarian/state.yaml#L1C1-L1C170).

Owlbot related files are also cleaned up

---------

Co-authored-by: ohmayr <omairn@google.com>

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-pandas/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 #<issue_number_goes_here> 🦕

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

Librarian Version: v0.6.0
Language Image:
us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:c8612d3fffb3f6a32353b2d1abd16b61e87811866f7ec9d65b59b02eb452a620
<details><summary>pandas-gbq: 0.31.0</summary>

##
[0.31.0](v0.30.0...v0.31.0)
(2025-11-17)

### Features

* add pandas_gbq.sample (#983)
([ac771c1](ac771c12))

</details>

---------

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

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

Librarian Version: v0.7.0
Language Image:
us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:c8612d3fffb3f6a32353b2d1abd16b61e87811866f7ec9d65b59b02eb452a620
<details><summary>pandas-gbq: 0.31.1</summary>

##
[0.31.1](v0.31.0...v0.31.1)
(2025-12-08)

</details>

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>