build: bump btcd, btcwallet and neutrino to latest versions

docs/INSTALL.md

@@ -353,6 +353,9 @@ bitcoind:
 
 On FreeBSD, use gmake instead of make.
 
+In order to be able to utilize the latest Taproot features, [`btcd` version
+`v0.23.1`](https://github.com/btcsuite/btcd/releases/tag/v0.23.1) MUST be used.
+
 To install btcd, run the following commands:
 
 Install **btcd**:

docs/release-notes/release-notes-0.15.0.md

@@ -288,6 +288,8 @@ from occurring that would result in an erroneous force close.](https://github.co
 
 * [A new version of the internal `tor` module was tagged and updated for the main module](https://github.com/lightningnetwork/lnd/pull/6612).
 
+* [`lnd` now packages the latest versions of the btcd libraries, btcwallet, and neutrino](https://github.com/lightningnetwork/lnd/pull/6627)
+
 
 ## RPC Server