chore(deps): bump jinja2 in /tests/apps/python-flask
chore(deps): bump jinja2 in /tests/apps/python-flask

Bumps [jinja2](https://github.com/pallets/jinja) from 2.10.1 to 2.10.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.10.1...2.10.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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