ci(fedora41): restore the path to `dnf` cache

So, images would really use it again!
This reduce build time up to 25%!

This was accidentally broken by commit 46d89b8524 (ci: update Linux
image to Fedora 41, 2024-10-23, v3.31.0-rc3~7^2~2) by misdiagnosing an
error.