.github/workflows/go: Go 1.21 or higher

Author: ydnar

.github/workflows/go.yaml

@@ -33,7 +33,7 @@ jobs:
     timeout-minutes: 15
     strategy:
       matrix:
-        go-version: ["1.20", "1.21", "1.22"]
+        go-version: ["1.21", "1.22"]
     steps:
       - name: Checkout repo
         uses: actions/checkout@v4