⬆️ Bump virtualenv from 20.15.1 to 20.16.5

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.15.1 to 20.16.5.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.15.1...20.16.5)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -232,7 +232,6 @@ six==1.16.0
     #   asttokens
     #   exhale
     #   python-dateutil
-    #   virtualenv
 snowballstemmer==2.2.0
     # via sphinx
 soupsieve==2.3.2.post1
@@ -293,7 +292,7 @@ typing-extensions==4.3.0
     #   myst-parser
 urllib3==1.26.12
     # via requests
-virtualenv==20.15.1
+virtualenv==20.16.5
     # via pre-commit
 wcwidth==0.2.5
     # via prompt-toolkit