Bump grafanalib from 0.7.0 to 0.7.1 in /deploy/grafana-dashboard

Bumps [grafanalib](https://github.com/weaveworks/grafanalib) from 0.7.0 to 0.7.1.
- [Release notes](https://github.com/weaveworks/grafanalib/releases)
- [Changelog](https://github.com/weaveworks/grafanalib/blob/main/CHANGELOG.rst)
- [Commits](weaveworks/grafanalib@v0.7.0...v0.7.1)

---
updated-dependencies:
- dependency-name: grafanalib
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>