test with 1.21 as well

Author: jessepeterson

.github/workflows/on-push-pr.yml

@@ -9,7 +9,7 @@ jobs:
   format-build-test:
     strategy:
       matrix:
-        go-version: ['1.19.x']
+        go-version: ['1.19.x', '1.21.x']
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: