upgrade linter to 1.35 (#786)

* lint: added test that enforces Makefile and GH action linter versions are in sync
* workaround for linter gomnd problem - https://github.com/golangci/golangci-lint/issues/1653

internal/serverapi/serverapi.go

@@ -63,8 +63,7 @@ type PoliciesResponse struct {
 }
 
 // Empty represents empty request/response.
-type Empty struct {
-}
+type Empty struct{}
 
 // APIErrorCode indicates machine-readable error code returned in API responses.
 type APIErrorCode string