Bump bootstrap from 5.2.0-beta1 to 5.3.8

Bumps [bootstrap](https://github.com/twbs/bootstrap) from 5.2.0-beta1 to 5.3.8.
- [Release notes](https://github.com/twbs/bootstrap/releases)
- [Commits](twbs/bootstrap@v5.2.0-beta1...v5.3.8)

---
updated-dependencies:
- dependency-name: bootstrap
  dependency-version: 5.3.8
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]