⬆️ Bump pre-commit from 2.7.1 to 2.8.1 (#198)

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.7.1 to 2.8.1.
- [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@v2.7.1...v2.8.1)

Signed-off-by: dependabot[bot] <support@github.com>

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

requirements_dev.txt

@@ -2,7 +2,7 @@ autopep8==1.5.4
 black==20.8b1
 blacken-docs==1.8.0
 pip==20.2.4
-pre-commit==2.7.1
+pre-commit==2.8.1
 twine==3.2.0
 wheel==0.35.1
 yamllint==1.25.0