ci: bump virtualenv from 20.37.0 to 21.7.0 in /.github/workflows

[dependabot]

Bumps virtualenv from 20.37.0 to 21.7.0.

Release notes

Sourced from virtualenv's releases.

21.7.0

What's Changed

• Replace prettier with mdformat and yamlfmt by @​gaborbernat in pypa/virtualenv#3190
• 👷 ci: test against Python 3.15 beta by @​gaborbernat in pypa/virtualenv#3192

Full Changelog: pypa/virtualenv@21.6.1...21.7.0

21.6.1

What's Changed

• 🐛 fix(fish): harden prompt against shadowed builtins by @​gaborbernat in pypa/virtualenv#3185

Full Changelog: pypa/virtualenv@21.6.0...21.6.1

21.6.0

What's Changed

• ✨ feat(create): skip distutils hook on Python 3.10+ by @​gaborbernat in pypa/virtualenv#3184

Full Changelog: pypa/virtualenv@21.5.2...21.6.0

21.5.2

What's Changed

• 🐛 fix(seed): sync wheel regen script with seeder guard by @​gaborbernat in pypa/virtualenv#3175
• fix(upgrade): emit dash bullets in changelog by @​gaborbernat in pypa/virtualenv#3182
• Upgrade embedded pip/setuptools/wheel by @​github-actions[bot] in pypa/virtualenv#3180

Full Changelog: pypa/virtualenv@21.5.1...21.5.2

21.5.1

What's Changed

• 🐛 fix(seed): refuse to seed unsupported Python versions by @​gaborbernat in pypa/virtualenv#3173

Full Changelog: pypa/virtualenv@21.5.0...21.5.1

21.5.0

... (truncated)

Changelog

Sourced from virtualenv's changelog.

Features - 21.7.0

• Declare support for Python 3.15: CI now tests against the CPython 3.15 beta, including the free-threaded 3.15t build, and the Programming Language :: Python :: 3.15 classifier is advertised. (:issue:3192)

---

v21.6.1 (2026-07-10)

---

Bugfixes - 21.6.1

• Harden the fish activator prompt against user functions that shadow builtins. Routing functions, printf, string, echo and source/. through builtin stops a shadowing function (such as a dot-style directory navigator that redefines .) from hijacking the prompt and dropping the previous command's exit status, matching the CPython fix in [gh-140006](https://github.com/pypa/virtualenv/issues/140006) <https://github.com/python/cpython/issues/140006>_. (:issue:3185)

---

v21.6.0 (2026-07-06)

---

Features - 21.6.0

• Stop installing the _virtualenv.{py,pth} distutils import hook for Python 3.10 and later, where pip, setuptools and CPython already ignore the install config keys it guards against; this removes the hook's startup import cost. The hook is still installed for Python 3.9 - :issue:3181. (:issue:3181)

---

v21.5.2 (2026-07-06)

---

Bugfixes - 21.5.2

• Upgrade embedded wheels:

  • setuptools to 83.0.0 (:issue:3180)

---

v21.5.1 (2026-06-16)

---

Bugfixes - 21.5.1

• Refuse to create environments whose Python the bundled wheels no longer cover (currently below 3.9). virtualenv used to substitute the newest bundled pip, which cannot run on such a target, leaving a broken environment; seeder selection now rejects it up front with a clear error. --no-seed and third-party seeders that ship compatible

... (truncated)

Commits

• e6eb5b0 release 21.7.0
• 6d7bf90 Add changelog fragment for Python 3.15 support
• 482c7f9 👷 ci: test against Python 3.15 beta (#3192)
• a190228 [pre-commit.ci] pre-commit autoupdate (#3191)
• b54bc80 Replace prettier with mdformat and yamlfmt (#3190)
• c5dff1d chore(deps): bump astral-sh/setup-uv from 8.3.1 to 8.3.2 (#3189)
• cab4a0a chore(deps): bump astral-sh/setup-uv from 8.3.0 to 8.3.1 (#3188)
• c53b5b1 [pre-commit.ci] pre-commit autoupdate (#3187)
• 20b70f3 chore(deps): bump astral-sh/setup-uv from 8.2.0 to 8.3.0 (#3186)
• 544ca3d release 21.6.1
• Additional commits viewable in compare view