do not use go 1.20 in CI

Remove specific Go version setup from workflow

Author: vyskocilm

.github/workflows/go.yml

@@ -18,8 +18,6 @@ jobs:
 
     - name: Set up Go
       uses: actions/setup-go@v4
-      with:
-        go-version: '1.20'
 
     - name: Build
       run: go build -v ./...