fix workflow

Author: jan-hajek

.github/workflows/main.yml

@@ -46,7 +46,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v3
       with:
-        go-version: ~1.18
+        go-version: ~1.21
       id: go
 
     - name: Check out code into the Go module directory