build(deps-dev): bump types-flask from 1.1.4 to 1.1.6 in /requirements

Bumps [types-flask](https://github.com/python/typeshed) from 1.1.4 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>

requirements/requirements-ci.txt

@@ -765,7 +765,7 @@ types-click==7.1.1
     #   types-flask
 types-filelock==3.2.1
     # via -r requirements-dev.txt
-types-flask==1.1.4
+types-flask==1.1.6
     # via -r requirements-dev.txt
 types-jinja2==2.11.1
     # via

requirements/requirements-dev.txt

@@ -653,7 +653,7 @@ types-click==7.1.1
     # via types-flask
 types-filelock==3.2.1
     # via -r requirements-dev.in
-types-flask==1.1.4
+types-flask==1.1.6
     # via -r requirements-dev.in
 types-jinja2==2.11.1
     # via types-flask