Bump themes/projektemacher-base from 3e6d168 to 8f13eef

Bumps [themes/projektemacher-base](https://github.com/cmahnke/projektemacher-base) from `3e6d168` to `8f13eef`.
- [Commits](cmahnke/projektemacher-base@3e6d168...8f13eef)

---
updated-dependencies:
- dependency-name: themes/projektemacher-base
  dependency-type: direct:production
...

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