cerbero: Actually print the sha for which the cache was not found
There's a %s that's not being substituted. Replace a few more occurrences with f-strings, since they are less error-prone.
0:00:09.688000 Did not find cache for commit %s, looking for an older one...
https://gitlab.freedesktop.org/gstreamer/cerbero/-/jobs/29861406
Edited by Nirbheek Chauhan