Bump flask-flatpages from 0.6 to 0.7.0
Bump flask-flatpages from 0.6 to 0.7.0

Bumps [flask-flatpages](https://github.com/SimonSapin/Flask-FlatPages) from 0.6 to 0.7.0.
- [Release notes](https://github.com/SimonSapin/Flask-FlatPages/releases)
- [Commits](https://github.com/SimonSapin/Flask-FlatPages/compare/v0.6...v0.7.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jazzband/site,jazzband/site,jazzband/website,jazzband/jazzband-site,jazzband/website,jazzband/jazzband-site,jazzband/website,jazzband/website