Bump ejs from 3.1.6 to 3.1.8 in /research-hub-web

Bumps [ejs](https://github.com/mde/ejs) from 3.1.6 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@v3.1.6...v3.1.8)

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

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

Author: dependabot[bot]