Restore defaults in matrix

.github/workflows/test.yml

@@ -64,13 +64,17 @@ jobs:
   tests:
     runs-on: ${{ matrix.os || 'ubuntu' }}-latest
     strategy:
+      fail-fast: false  # Todo: remove this once windows tests pass
       matrix:
-        opt-mode: ["gas", "none", "codesize"]
+        os: [ubuntu]
+        python-version: [["3.11", "311"]]
+        opt-mode: [gas, none, codesize]
         debug: [true, false]
+        evm-version: [shanghai]
+        experimental-codegen: [false]
+        evm-backend: [revm]
 
-        # https://docs.github.com/en/actions/using-jobs/using-a-matrix-for-your-jobs#expanding-or-adding-matrix-configurations
         include:
-          # test default settings with 3.11 across all supported evm versions
           - debug: false
             opt-mode: gas
             evm-version: london