staticcheck: run main, remove staticcheck.conf

Pick up dominikh/go-tools@8273271 and drop the config to override enabled
checks. Adding the config was needed to make staticcheck pass after stringer
made a change violating SA4003. Generated files are now ignored for this check.

Signed-off-by: Timo Beckers <[email protected]>

Author: ti-mo

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Run staticcheck
         uses: dominikh/staticcheck-action@v1
         with:
-          version: "latest"
+          version: "master"
           install-go: false
 
       - name: Run golangci-lint