test(ci): trigger faster-whisper rebuild to observe per-arch+merge

The PR that introduced the per-arch + manifest-merge pilot (#9727)
only touched CI infrastructure files, so the path filter correctly
skipped backend builds on its merge commit. To observe the new
backend-merge-jobs flow assemble a real manifest list, this commit
touches faster-whisper's Makefile so its two new per-arch entries
schedule and the merge job runs.

The trailing comment is the smallest possible diff and is harmless
to the build.

Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>