Update virtualenv requirement from ==20.17.* to ==20.34.* in /docker/main

[dependabot]

Updates the requirements on virtualenv to permit the latest version.

Release notes

Sourced from virtualenv's releases.

20.34.0

What's Changed

• release 20.33.1 by @​gaborbernat in pypa/virtualenv#2943
• fix: Improve file limit test to catch SystemExit or RuntimeError by @​esafak in pypa/virtualenv#2936
• feat: Abstract out caching in discovery by @​esafak in pypa/virtualenv#2946
• CI: Add PyPy 3.11 to CI checks by @​esafak in pypa/virtualenv#2934
• feat: Decouple FileCache from py_info by @​esafak in pypa/virtualenv#2947
• feat: Remove references to py_info from FileCache by @​esafak in pypa/virtualenv#2948
• refactor: Decouple discovery from creator plugins by @​esafak in pypa/virtualenv#2949
• refactor: Decouple discovery by duplicating info utils by @​esafak in pypa/virtualenv#2951
• fix: Python in PATH takes precedence over uv-managed Pythons by @​edgarrmondragon in pypa/virtualenv#2952
• [pre-commit.ci] pre-commit autoupdate by @​pre-commit-ci[bot] in pypa/virtualenv#2950
• Bump pip to 25.2 by @​gaborbernat in pypa/virtualenv#2953

Full Changelog: pypa/virtualenv@20.33.1...20.34.0

Changelog

Sourced from virtualenv's changelog.

v20.34.0 (2025-08-13)

Features - 20.34.0

- Abstract out caching in discovery - by :user:`esafak`.
  Decouple `FileCache` from `py_info` (discovery) - by :user:`esafak`.
  Remove references to py_info in FileCache - by :user:`esafak`.
  Decouple discovery from creator plugins - by :user:`esafak`.
  Decouple discovery by duplicating info utils - by :user:`esafak`. (:issue:`2074`)
- Add PyPy 3.11 support. Contributed by :user:`esafak`. (:issue:`2932`)
Bugfixes - 20.34.0

• Upgrade embedded wheel pip to 25.2 from 25.1.1 - by :user:gaborbernat. (:issue:2333)
• Accept RuntimeError in test_too_many_open_files, by :user:esafak (:issue:2935)
• Python in PATH takes precedence over uv-managed python. Contributed by :user:edgarrmondragon. (:issue:2952)

v20.33.1 (2025-08-05)

Bugfixes - 20.33.1

- Correctly unpack _get_tcl_tk_libs() response in PythonInfo.
  Contributed by :user:`esafak`. (:issue:`2930`)
- Restore `py_info.py` timestamp in `test_py_info_cache_invalidation_on_py_info_change`
  Contributed by :user:`esafak`. (:issue:`2933`)
v20.33.0 (2025-08-03)
Features - 20.33.0

• Added support for Tcl and Tkinter. You're welcome. Contributed by :user:esafak. (:issue:425)

Bugfixes - 20.33.0

- Prevent logging setup when --help is passed, fixing a flaky test.
  Contributed by :user:`esafak`. (:issue:`u`)
- Fix cache invalidation for PythonInfo by hashing `py_info.py`.
  Contributed by :user:`esafak`. (:issue:`2467`)
- When no discovery plugins are found, the application would crash with a StopIteration.
  This change catches the StopIteration and raises a RuntimeError with a more informative message.
  Contributed by :user:`esafak`. (:issue:`2493`)
- Stop `--try-first-with` overriding absolute `--python` paths.
  Contributed by :user:`esafak`. (:issue:`2659`)
- Force UTF-8 encoding for pip download
  Contributed by :user:`esafak`. (:issue:`2780`)
- Creating a virtual environment on a filesystem without symlink-support would fail even with `--copies`
</tr></table> 

... (truncated)

Commits

• a1ed8bb release 20.34.0
• 9ef8512 Squash changelog entry for 2074
• 9b285ef Bump pip to 25.2 (#2953)
• e45a509 [pre-commit.ci] pre-commit autoupdate (#2950)
• dfdae19 fix: Python in PATH takes precedence over uv-managed Pythons (#2952)
• 1f4c76e refactor: Decouple discovery by duplicating info utils (#2951)
• c41da72 refactor: Decouple discovery from creator plugins (#2949)
• 02ae86f feat: Remove references to py_info from FileCache (#2948)
• 03f4800 feat: Decouple FileCache from py_info (#2947)
• d280b76 CI: Add PyPy 3.11 to CI checks (#2934)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #20411.