Bump virtualenv from 20.36.1 to 21.1.0 (#72)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.36.1 to 21.1.0.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.36.1...21.1.0)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-version: 21.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "jupyterlab>=4.4.8",
     "pip>=25.3",
     "urllib3>=2.6.0",
-    "virtualenv==20.36.1",
+    "virtualenv==21.1.0",
 ]
 
 [dependency-groups]