build(deps): bump pre-commit from 2.14.0 to 2.15.0 in /.github/workflows (#136)

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.14.0 to 2.15.0.
- [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@v2.14.0...v2.15.0)

---
updated-dependencies:
- dependency-name: pre-commit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

.github/workflows/constraints.txt

@@ -1,5 +1,5 @@
 pip<21.3
-pre-commit==2.14.0
+pre-commit==2.15.0
 black==21.8b0
 flake8==3.9.2
 reorder-python-imports==2.6.0