chore(swarm): add PR number to 0.45.1 release

Pull-Request: #5548.

Author: jxs

swarm/CHANGELOG.md

@@ -1,8 +1,8 @@
 ## 0.45.1
 
-- Update `libp2p-swarm-derive` to version `0.35.0`, see [PR XXXX]
+- Update `libp2p-swarm-derive` to version `0.35.0`, see [PR 5545]
 
-[PR XXXX]: https://github.com/libp2p/rust-libp2p/pull/XXXX
+[PR 5545]: https://github.com/libp2p/rust-libp2p/pull/5545
 
 ## 0.45.0