Enable Pharo 12 and 13 for the CI

Author: jordanmontt

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        smalltalk: [ Pharo64-9.0, Pharo64-10, Pharo64-11 ]
+        smalltalk: [ Pharo64-9.0, Pharo64-10, Pharo64-11, Pharo64-12, Pharo64-13 ]
     name: ${{ matrix.smalltalk }}
     steps:
       - uses: actions/checkout@v2