lnd: patch update from 0.16.3 to 0.16.4

a memory leak bugfix:
https://github.com/btcsuite/btcwallet/pull/872

https://github.com/lightningnetwork/lnd/releases/tag/v0.16.4-beta

lnd/env

@@ -1,6 +1,6 @@
-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
+LND_VERSION_DIR_AARCH64=lnd-linux-arm64-v0.16.4-beta
+LND_URL_AARCH64=https://github.com/lightningnetwork/lnd/releases/download/v0.16.4-beta/lnd-linux-arm64-v0.16.4-beta.tar.gz
+LND_SHA256_AARCH64=ec5ee06edeef8af55edb18460ffc6a4b32b9fa632ff011883425e83fabcafa9e
 
 # binaries and config root; data is elsewhere, in /ssd/lnd as per lnd conf.
 LND_HOME=/home/lnd