Bump pytest-flask from 1.2.0 to 1.3.0

Bumps [pytest-flask](https://github.com/pytest-dev/pytest-flask) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/pytest-dev/pytest-flask/releases)
- [Changelog](https://github.com/pytest-dev/pytest-flask/blob/master/docs/changelog.rst)
- [Commits](pytest-dev/pytest-flask@1.2.0...1.3.0)

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

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