docs: add release note

docs/release-notes/release-notes-0.17.4.md

@@ -25,6 +25,10 @@
   created nor accepted. This PR fixes this issue and enhances the test suite
   for this behavior.
  
+* [Fix deadlock possibility in
+  FilterKnownChanIDs](https://github.com/lightningnetwork/lnd/pull/8400) by
+  ensuring the `cacheMu` mutex is acquired before the main database lock.
+
 # New Features
 ## Functional Enhancements
 ## RPC Additions
@@ -46,3 +50,5 @@
 ## Tooling and Documentation
 
 # Contributors (Alphabetical Order)
+* Elle Mouton
+* ziggie1984