main.yml: fail-fast: false so we can see all test results

Author: cclauss

.github/workflows/main.yml

@@ -39,6 +39,7 @@ jobs:
   test:
     strategy:
       # https://blog.jaraco.com/efficient-use-of-ci-resources/
+      fail-fast: false
       matrix:
         python:
         - "3.9"