Bump pre-commit from 2.5.1 to 2.6.0

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/master/CHANGELOG.md)
- [Commits](pre-commit/pre-commit@v2.5.1...v2.6.0)

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

Author: dependabot-preview[bot]

requirements/dev.txt

@@ -28,7 +28,7 @@ packaging==20.4           # via pallets-sphinx-themes, pytest, sphinx, tox
 pallets-sphinx-themes==1.2.3  # via -r requirements/docs.in
 pip-tools==5.2.1          # via -r requirements/dev.in
 pluggy==0.13.1            # via pytest, tox
-pre-commit==2.5.1         # via -r requirements/dev.in
+pre-commit==2.6.0         # via -r requirements/dev.in
 py==1.8.1                 # via pytest, tox
 pygments==2.6.1           # via sphinx
 pyparsing==2.4.7          # via packaging