Bump pip-tools from 5.0.0 to 5.1.1
Bump pip-tools from 5.0.0 to 5.1.1

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 5.0.0 to 5.1.1.
- [Release notes](https://github.com/jazzband/pip-tools/releases)
- [Changelog](https://github.com/jazzband/pip-tools/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jazzband/pip-tools/compare/5.0.0...5.1.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jerr0328/isitsnowinginberlin,jerr0328/isitsnowinginberlin