build(deps): bump virtualenv from 20.24.5 to 20.26.6 (#322)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.24.5 to 20.26.6.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.24.5...20.26.6)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: indirect
...

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

Author: dependabot[bot]

requirements.txt

@@ -4,8 +4,6 @@
 #
 #    pip-compile
 #
-appnope==0.1.3
-    # via ipython
 asttokens==2.4.0
     # via stack-data
 attrs==23.1.0
@@ -113,7 +111,7 @@ traitlets==5.11.2
     # via
     #   ipython
     #   matplotlib-inline
-virtualenv==20.24.5
+virtualenv==20.26.6
     # via pre-commit
 wcwidth==0.2.8
     # via prompt-toolkit