reorder rspec test matrix

until we deal with the contracts gem version situation the 2.7.5 build will fail,
which also runs before the 3.1.2 build. We want to see that the 3.1.2 build is otherwise
working properly

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.7.5', '3.1.2' ]
+        ruby: [ '3.1.2', '2.7.5' ]
     permissions:
       contents: read