mgr/dashboard: bump follow-redirects

mgr/dashboard: bump follow-redirects

Bumps [follow-redirects](https://github.com/follow-redirects/follow-redirects) from 1.15.3 to 1.15.6.
- [Release notes](https://github.com/follow-redirects/follow-redirects/releases)
- [Commits](https://github.com/follow-redirects/follow-redirects/compare/v1.15.3...v1.15.6)

---
updated-dependencies:
- dependency-name: follow-redirects
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit b0275929c07ebcfba3e7877020f182c6d8b74435)