Bump flaky from 3.7.0 to 3.8.1

Bumps [flaky](https://github.com/box/flaky) from 3.7.0 to 3.8.1.
- [Release notes](https://github.com/box/flaky/releases)
- [Changelog](https://github.com/box/flaky/blob/master/HISTORY.rst)
- [Commits](box/flaky@v3.7.0...v3.8.1)

---
updated-dependencies:
- dependency-name: flaky
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

dev_requirements.txt

@@ -10,6 +10,6 @@ wheel==0.42
 pre-commit==3.5.0;python_version<"3.9"
 pre-commit==3.6.2;python_version>="3.9"
 pytest-dotenv==0.5.2
-flaky==3.7.0
+flaky==3.8.1
 pytest-xdist==3.5.0
 -e .