Bump virtualenv from 21.2.0 to 21.2.1 (#107)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 21.2.0 to 21.2.1.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@21.2.0...21.2.1)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-version: 21.2.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -43,7 +43,7 @@ development = [
   "pytest==8.4.2; python_version <= '3.11'",
   "pytest==9.0.3; python_version > '3.11'",
   "twine==6.2.0",
-  "virtualenv==21.2.0",
+  "virtualenv==21.2.1",
   "wheel==0.46.3",
 ]
 documentation = [