CI: Don't fail fast when a single test matrix slot fails

Author: amotl

.github/workflows/tests.yml

@@ -21,6 +21,7 @@ jobs:
   tests:
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ "ubuntu-22.04", "macos-15-intel" ] # , windows-latest ]
         ruby-version: [ "2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2" ]