Filter date in GitHub release URLs for `python_install_no_cache` test (#15204)
## Summary
fixes https://github.com/astral-sh/uv/issues/15172
This change adds a regex filter to normalize dates in GitHub release
URLs within the `python_install_no_cache` test snapshot.
**Problem:**
The test was hardcoding the date `20250808` in the expected error
message URL:
```console
https://github.com/astral-sh/python-build-standalone/releases/download/20250808/cpython-3.12.[PATCH]-[DATE]-[PLATFORM].tar.gz
```
This creates a maintenance burden as the snapshot would need to be
updated whenever the underlying Python release date changes.
**Solution:**
Added a regex filter `r"releases/download/\d{8}/"` →
`"releases/download/[DATE]/"` to replace any 8-digit date in the GitHub
release URL path with a generic `[DATE]` placeholder.
**Result:**
The test is now resilient to new Python releases and won't require
snapshot updates when the underlying release date changes. The error
message now consistently shows:
```console
https://github.com/astral-sh/python-build-standalone/releases/download/[DATE]/cpython-3.12.[PATCH]-[DATE]-[PLATFORM].tar.gz
```
## Test Plan
`python_install` tests seem to pass ✅
```console
$ cargo test --package uv --test it -- python_install
Compiling uv-cli v0.0.1 (/home/ubaid/projects/uv/crates/uv-cli)
Compiling uv v0.8.8 (/home/ubaid/projects/uv/crates/uv)
Finished `test` profile [unoptimized + debuginfo] target(s) in 19.04s
Running tests/it/main.rs (target/debug/deps/it-14d47eb0324a8a0a)
running 30 tests
test python_install::python_install_unknown ... ok
test network::python_install_io_error ... ok
test network::python_install_http_500 ... ok
test python_install::python_install_invalid_request ... ok
test python_install::python_install_broken_link ... ok
test python_install::python_install_preview_no_bin ... ok
test python_install::regression_cpython ... ok
test python_install::uninstall_last_patch ... ok
test python_install::install_no_transparent_upgrade_with_venv_patch_specification ... ok
test python_install::install_lower_patch_automatically ... ok
test python_install::uninstall_highest_patch ... ok
test python_install::install_transparent_patch_upgrade_venv_module ... ok
test python_install::python_install_default_from_env ... ok
test python_install::python_install ... ok
test python_install::python_reinstall_patch ... ok
test python_install::python_install_force ... ok
test python_install::install_transparent_patch_upgrade_uv_venv ... ok
test python_install::install_multiple_patches ... ok
test python_install::python_install_314 ... ok
test python_install::python_install_default ... ok
test python_install::python_install_automatic ... ok
test python_install::python_install_freethreaded ... ok
test python_install::python_install_preview_upgrade ... ok
test python_install::python_install_no_cache ... ok
test python_install::python_install_default_preview ... ok
test python_install::python_install_preview ... ok
test python_install::python_install_minor ... ok
test python_install::python_reinstall ... ok
test python_install::python_install_cached ... ok
test python_install::python_install_multiple_patch ... ok
test result: ok. 30 passed; 0 failed; 0 ignored; 0 measured; 2207 filtered out; finished in 23.34s
```