README: update with correct link to pending CL

https://golang.org/cl/334689

README.md

@@ -2,7 +2,7 @@
 
 Example [Go](https://golang.org/) package built into an [XCFramework](https://developer.apple.com/documentation/swift_packages/distributing_binary_frameworks_as_swift_packages) for [Swift Package Manager](https://swift.org/package-manager/). This package implements a simple QUIC [datagram](https://github.com/quicwg/datagram) server using [quic-go](https://github.com/https://github.com/lucas-clemente/quic-go).
 
-Depends on <https://golang.org/cl/310949> (merged as of 2021-07-10).
+Depends on <https://golang.org/cl/334689>.
 
 ## Requirements