chore(deps-dev): update pre-commit requirement from ~=2.0.1 to… (#6849)

Updates the requirements on [pre-commit](https://github.com/pre-commit/pre-commit) to permit the latest version.
- [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@v2.0.1...v2.1.0)

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

Author: dependabot-preview[bot]

requirements/dev.txt

@@ -5,5 +5,5 @@ pylint~=2.4
 pep8~=1.7
 isort~=4.3.21
 black~=19.10b0
-pre-commit~=2.0.1
+pre-commit~=2.1.0
 pytype~=2020.2.6