github: don't fail fast on Fedora unit tests

Fedora 41 unit tests are currently failing due to an issue with
the repositories and are non-essential for merging (which is common for
rawhide and early branching periods).
However, the fail-fast property defaults to true, which causes the
other Fedora tests to get cancelled when F41 fails.

Disable fail-fast so that F40 tests keep running when F41 tests fail.

This is the same change we made for CS tests
3b81a90

.github/workflows/tests.yml

@@ -21,6 +21,7 @@ jobs:
           - 39
           - 40
           - 41
+      fail-fast: false  # if one fails, keep the other(s) running
     name: "🛃 Unit tests (Fedora ${{ matrix.fedora_version }})"
     runs-on: ubuntu-latest
     container: