lnd: patch update from 0.16.2 to 0.16.3

CPU usage optimization in mempool and other improvements:
https://github.com/lightningnetwork/lnd/blob/master/docs/release-notes/release-notes-0.16.3.md

lnd/env

@@ -1,6 +1,6 @@
-LND_VERSION_DIR_AARCH64=lnd-linux-arm64-v0.16.2-beta
-LND_URL_AARCH64=https://github.com/lightningnetwork/lnd/releases/download/v0.16.2-beta/lnd-linux-arm64-v0.16.2-beta.tar.gz
-LND_SHA256_AARCH64=21e2b6640e06c84c43c5610f7f7613f609cdb09129e6704772436d6209a862af
+LND_VERSION_DIR_AARCH64=lnd-linux-arm64-v0.16.3-beta
+LND_URL_AARCH64=https://github.com/lightningnetwork/lnd/releases/download/v0.16.3-beta/lnd-linux-arm64-v0.16.3-beta.tar.gz
+LND_SHA256_AARCH64=2f50b9123d5af154c7ea42120fd5a185668daf3d519e06c1deb8c20005986006
 
 # binaries and config root; data is elsewhere, in /ssd/lnd as per lnd conf.
 LND_HOME=/home/lnd