Simplify CI matrix

Author: jqtrde

.github/workflows/test.yaml

@@ -9,13 +9,8 @@ jobs:
   test:
     strategy:
       matrix:
-        include:
-          - python-version: '3.10'
-            os: ubuntu-22.04
-          - python-version: '3.11'
-            os: ubuntu-22.04
-          - python-version: '3.12'
-            os: ubuntu-22.04
+        os: ["ubuntu-22.04"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     runs-on: ${{ matrix.os }}