Bump types-flask from 1.1.5 to 1.1.6 in /requirements

Bumps [types-flask](https://github.com/python/typeshed) from 1.1.5 to 1.1.6.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-flask
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/dev-requirements.txt

@@ -31,7 +31,7 @@ sphinx_paramlinks==0.5.2
 sphinxcontrib-httpdomain==1.8.0
 sphinxcontrib-spelling==7.2.1
 twine==3.6.0
-types-Flask==1.1.5
+types-Flask==1.1.6
 types-freezegun==1.1.3
 types-PyYAML==6.0.1
 types-requests==2.26.0