Bump virtualenv from 20.16.4 to 20.26.6

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.16.4 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@20.16.4...20.26.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -12,9 +12,9 @@ cfgv==3.3.1
     # via pre-commit
 click==8.1.3
     # via pip-tools
-distlib==0.3.6
+distlib==0.3.9
     # via virtualenv
-filelock==3.8.0
+filelock==3.16.1
     # via virtualenv
 identify==2.5.3
     # via pre-commit
@@ -26,7 +26,7 @@ pep517==0.13.0
     # via build
 pip-tools==6.8.0
     # via -r requirements.in
-platformdirs==2.5.2
+platformdirs==4.3.6
     # via virtualenv
 pre-commit==2.20.0
     # via -r requirements.in
@@ -36,7 +36,11 @@ pyyaml==6.0
     # via pre-commit
 toml==0.10.2
     # via pre-commit
-virtualenv==20.16.4
+tomli==2.2.1
+    # via
+    #   build
+    #   pep517
+virtualenv==20.26.6
     # via pre-commit
 wheel==0.38.1
     # via