Use new gofumpt (#21613)

Update tinylib. Should fix CI.

`gofumpt -w .&&go generate ./...`

cmd/handler-utils.go

@@ -466,7 +466,7 @@ func getHostName(r *http.Request) (hostName string) {
 	} else {
 		hostName = r.Host
 	}
-	return
+	return hostName
 }
 
 // Proxy any request to an endpoint.
@@ -500,5 +500,5 @@ func proxyRequest(ctx context.Context, w http.ResponseWriter, r *http.Request, e
 
 	r.URL.Host = ep.Host
 	f.ServeHTTP(w, r)
-	return
+	return success
 }