Fix tests for Python 3.15.0a5+

[edgarrmondragon]

Purpose

Fixes this exception in the tests:

TypeError: expected string or bytes-like object, got '_TranslationProxy'

and

FAILED tests/test_builders/test_build_linkcheck.py::test_too_many_requests_retry_after_without_header - assert '\x1b[90m127.0.0.1 - - []\x1b[0m "HEAD \x1b[36m/\x1b[0m HTTP/1.1" \x1b[33m429 \x1b[90m-\x1b[0m\n\x1b[90m127.0.0.1 - - []\x1b[0m "HEAD \x1b[36m/\x1b[0m HTTP/1.1" \x1b[32m200 \x1b[90m-\x1b[0m\n' == '127.0.0.1 - - [] "HEAD / HTTP/1.1" 429 -\n127.0.0.1 - - [] "HEAD / HTTP/1.1" 200 -\n'

The outstanding failures are unrelated:

• Lint/type checks (ty)
• Testing with the latest Docutils from source
• LaTeX (same as the one above)

References

• gh-146292: Add colour to http.server logs python/cpython#146293
• Cannot use lazy translation proxies in argparse help python/cpython#148468

[gmilde]

The outstanding failures are unrelated:
[...]
Testing with the latest Docutils from source
LaTeX (same as the one above)

I work on a fix for Docutils for the changed ID in tests/test_intl/test_intl.py:1559:.
For the LaTeX writer issue, see issue #14402.