googleapis-common-protos 1.69.0 installs `docs/conf.py` into site-packages directory

[mgorny]

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Summary of the issue

Context
I've upgraded googleapis-common-protos to version 1.69.0.

Expected Behavior:
Clean install containing only google* packages.

Actual Behavior:
A stray /usr/lib/python3.13/site-packages/docs/conf.py was installed as part of this package.

API client name and version

googleapis-common-protos 1.69.0

Reproduction steps: code

uv venv
uv pip install googleapis-common-protos==1.69.0
ls .venv/lib/python3.13/site-packages/docs/

Reproduction steps: supporting files

No response

Reproduction steps: actual results

$ ls .venv/lib/python3.13/site-packages/docs/
conf.py

Reproduction steps: expected results

$ ls .venv/lib/python3.13/site-packages/docs/
ls: cannot access '.venv/lib/python3.13/site-packages/docs/': No such file or directory

OS & version + platform

Gentoo Linux amd64

Python environment

3.13.2

Python dependencies

Package                  Version
------------------------ -------
googleapis-common-protos 1.69.0
protobuf                 5.29.3

Additional context

Most likely missing docs in tool.setuptools.packages.find.exclude key.

[mgorny]

Thank you!