Bump flake8-isort from 4.1.2.post0 to 4.2.0 (#1237)

Bumps [flake8-isort](https://github.com/gforcada/flake8-isort) from 4.1.2.post0 to 4.2.0.
- [Release notes](https://github.com/gforcada/flake8-isort/releases)
- [Changelog](https://github.com/gforcada/flake8-isort/blob/master/CHANGES.rst)
- [Commits](gforcada/flake8-isort@4.1.2.post0...4.2.0)

---
updated-dependencies:
- dependency-name: flake8-isort
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

flake8-requirements.txt

@@ -16,7 +16,7 @@ flake8-fixme==1.1.1                     # "fix me" counter
 flake8-functions==0.0.7                 # function linting
 flake8-html==0.4.2                      # html output
 flake8-if-statements==0.1.0             # condition linting
-flake8-isort==4.1.2.post0                     # runs isort
+flake8-isort==4.2.0                     # runs isort
 flake8-mutable==1.2.0                   # mutable default argument detection
 flake8-pep3101==1.3.0                   # new-style format strings only
 flake8-print==5.0.0                     # complain about print statements in code