build(deps): bump leaflet and @types/leaflet in /frontend

Bumps [leaflet](https://github.com/Leaflet/Leaflet) and [@types/leaflet](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/leaflet). These dependencies needed to be updated together.

Updates `leaflet` from 1.7.1 to 1.9.4
- [Release notes](https://github.com/Leaflet/Leaflet/releases)
- [Changelog](https://github.com/Leaflet/Leaflet/blob/main/CHANGELOG.md)
- [Commits](Leaflet/Leaflet@v1.7.1...v1.9.4)

Updates `@types/leaflet` from 1.7.9 to 1.9.8
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/leaflet)

---
updated-dependencies:
- dependency-name: leaflet
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: "@types/leaflet"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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