lnd: upgrade from 0.15.3 to 0.15.4

an emergency hot fix release due to a bug where lnd nodes are unable to
parse certain transactions with very large number of witness inputs.

https://github.com/lightningnetwork/lnd/releases/tag/v0.15.4-beta

lnd/env

@@ -1,6 +1,6 @@
-LND_VERSION_DIR_AARCH64=lnd-linux-arm64-v0.15.3-beta
+LND_VERSION_DIR_AARCH64=lnd-linux-arm64-v0.15.4-beta
-LND_URL_AARCH64=https://github.com/lightningnetwork/lnd/releases/download/v0.15.3-beta/lnd-linux-arm64-v0.15.3-beta.tar.gz
+LND_URL_AARCH64=https://github.com/lightningnetwork/lnd/releases/download/v0.15.4-beta/lnd-linux-arm64-v0.15.4-beta.tar.gz
-LND_SHA256_AARCH64=f2584e3d817e0fa7e1edc99cd224ff34486c51777750482b1a82835c8e415647
+LND_SHA256_AARCH64=12d4ce1c3340e4fde4c691f426399c5bc9eb929336a4705c27ee9a83bc58ae65
 
 LND_HOME=/home/lnd