Bump virtualenv from 20.13.3 to 20.26.6 in /.requirements (#1436)

Bumps [virtualenv](https://github.com/pypa/virtualenv) from 20.13.3 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@20.13.3...20.26.6)

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

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

.requirements/all.txt

@@ -36,13 +36,13 @@ darglint==1.8.1
     # via -r dev.in
 decorator==5.1.1
     # via ipython
-distlib==0.3.4
+distlib==0.3.9
     # via virtualenv
 execnet==1.9.0
     # via pytest-xdist
 executing==0.8.3
     # via stack-data
-filelock==3.6.0
+filelock==3.16.1
     # via virtualenv
 flake8==4.0.1
     # via
@@ -153,7 +153,7 @@ pickleshare==0.7.5
     # via ipython
 pip-tools==6.5.1
     # via -r dev.in
-platformdirs==2.5.1
+platformdirs==4.3.6
     # via
     #   black
     #   virtualenv
@@ -226,7 +226,6 @@ six==1.16.0
     #   asttokens
     #   multipledispatch
     #   python-dateutil
-    #   virtualenv
 sortedcontainers==2.4.0
     # via hypothesis
 stack-data==0.2.0
@@ -255,7 +254,7 @@ typing-extensions==4.9.0
     # via black
 unyt==2.8.0
     # via -r engineering.in
-virtualenv==20.13.3
+virtualenv==20.26.6
     # via pre-commit
 watchdog==2.1.6
     # via mkdocs

.requirements/dev.txt

@@ -14,9 +14,9 @@ click==8.0.4
     #   pip-tools
 darglint==1.8.1
     # via -r dev.in
-distlib==0.3.4
+distlib==0.3.9
     # via virtualenv
-filelock==3.6.0
+filelock==3.16.1
     # via virtualenv
 flake8==4.0.1
     # via -r dev.in
@@ -38,7 +38,7 @@ pep517==0.12.0
     # via pip-tools
 pip-tools==6.5.1
     # via -r dev.in
-platformdirs==2.5.1
+platformdirs==4.3.6
     # via
     #   black
     #   virtualenv
@@ -50,8 +50,6 @@ pyflakes==2.4.0
     # via flake8
 pyyaml==6.0
     # via pre-commit
-six==1.16.0
-    # via virtualenv
 toml==0.10.2
     # via pre-commit
 tomli==2.0.1
@@ -60,7 +58,7 @@ tomli==2.0.1
     #   pep517
 typing-extensions==4.10.0
     # via black
-virtualenv==20.13.3
+virtualenv==20.26.6
     # via pre-commit
 wheel==0.38.1
     # via pip-tools