Merge pull request #9137 from ViktorTigerstrom/2024-09-sync-lock-fix

lnd: allow shutdown signal during `IsSynced` check

docs/release-notes/release-notes-0.19.0.md

@@ -36,6 +36,10 @@
   feature-bit](https://github.com/lightningnetwork/lnd/pull/9143) for invoices 
   containing blinded paths.
 
+* [Fix a bug](https://github.com/lightningnetwork/lnd/pull/9137) that prevented
+  a graceful shutdown of LND during the main chain backend sync check in certain
+  cases.
+
 # New Features
 ## Functional Enhancements
 ## RPC Additions
@@ -103,4 +107,5 @@
 * CharlieZKSmith
 * Elle Mouton
 * Pins
+* Viktor Tigerström
 * Ziggie