chore(deps): bump ejs from 2.7.4 to 3.1.8 in /superset-frontend (#21046)

Bumps [ejs](https://github.com/mde/ejs) from 2.7.4 to 3.1.8.
- [Release notes](https://github.com/mde/ejs/releases)
- [Changelog](https://github.com/mde/ejs/blob/main/CHANGELOG.md)
- [Commits](mde/ejs@v2.7.4...v3.1.8)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
...

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

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