Bump lit-element from 3.3.2 to 3.3.3 in /frontend

Bumps [lit-element](https://github.com/lit/lit/tree/HEAD/packages/lit-element) from 3.3.2 to 3.3.3.
- [Release notes](https://github.com/lit/lit/releases)
- [Changelog](https://github.com/lit/lit/blob/main/packages/lit-element/CHANGELOG.md)
- [Commits](https://github.com/lit/lit/commits/[email protected]/packages/lit-element)

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

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