Do not cancel concurrent CI matrix jobs

Failing fast makes it impossible to determine if the issue is specific
to one job in the matrix or not, as we would never get the results from
the others to compare.

Author: amarshall-dd

.github/workflows/test.yml

@@ -76,6 +76,7 @@ jobs:
 
   test:
     strategy:
+      fail-fast: false
       matrix:
         python-version: ["3.7", "3.12"]
         platform: [ubuntu-22.04, ubuntu-latest, macos-latest] # windows-latest