Bump flot in /themes/common-theme/webapp/common-theme/js (#532)

Bumps [flot](https://github.com/flot/flot) from 4.2.2 to 4.2.3.
- [Release notes](https://github.com/flot/flot/releases)
- [Changelog](https://github.com/flot/flot/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flot/flot/compare/v4.2.2...v4.2.3)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
2 files changed