ci: set fail-fast false for test matrix

Allow all matrix jobs to run even if one fails

Author: tony

.github/workflows/tests.yml

@@ -9,6 +9,7 @@ jobs:
 
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         python-version: ['3.9', '3.13']
         tmux-version: ['2.6', '2.7', '2.8', '3.0a', '3.1b', '3.2a', '3.3a', '3.4', '3.5', 'master']