Update virtualenv requirement from ==20.23.* to ==20.24.* (#174)

Updates the requirements on [virtualenv](https://github.com/pypa/virtualenv) to permit the latest version.
- [Release notes](https://github.com/pypa/virtualenv/releases)
- [Changelog](https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst)
- [Commits](pypa/virtualenv@20.23.0...20.24.2)

---
updated-dependencies:
- dependency-name: virtualenv
  dependency-type: direct:production
...

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

requirements.txt

@@ -15,5 +15,5 @@ requests-cache==1.1.*
 six==1.16.*
 tqdm==4.65.*
 urllib3==2.0.*
-virtualenv==20.23.*
+virtualenv==20.24.*
 wrapt==1.15.*