downgrade syn

.github/workflows/covector-version-or-publish-v1.yml

@@ -109,6 +109,7 @@ jobs:
           cargo update -p tokio-stream --precise 0.1.14
           cargo update -p tokio-util --precise 0.7.10
           cargo update -p os_pipe --precise 1.1.5
+          cargo update -p syn --precise 2.0.67
 
       - name: test build
         run: cargo check --target ${{ matrix.platform.target }} --features tracing,compression,wry,linux-protocol-headers,isolation,custom-protocol,api-all,cli,updater,system-tray,windows7-compat,http-multipart,test