Bump pre-commit from 2.8.2 to 2.9.3 in /.github/workflows

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.8.2 to 2.9.3.
- [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@v2.8.2...v2.9.3)

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

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
 pip==20.3.1
-pre-commit==2.8.2
+pre-commit==2.9.3
 nox==2020.8.22
 cookiecutter==1.7.2