Bump react-codemirror2 from 7.2.1 to 7.3.0 (#3015)

Bumps [react-codemirror2](https://github.com/scniro/react-codemirror2) from 7.2.1 to 7.3.0.
- [Release notes](https://github.com/scniro/react-codemirror2/releases)
- [Changelog](https://github.com/scniro/react-codemirror2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/scniro/react-codemirror2/commits/7.3.0)

---
updated-dependencies:
- dependency-name: react-codemirror2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>