Merge pull request #7464 from guggero/script-builder-capacity

input: reduce memory allocation for ScriptBuilder

docs/release-notes/release-notes-0.16.1.md

@@ -46,7 +46,10 @@ https://github.com/lightningnetwork/lnd/pull/7359)
 
 * [Return `FEE_INSUFFICIENT` before checking balance for incoming low-fee
   HTLCs.](https://github.com/lightningnetwork/lnd/pull/7490).
- 
+
+* Optimize script allocation size in order to save
+  [memory](https://github.com/lightningnetwork/lnd/pull/7464).
+
 ## Spec
 
 * [Add test vectors for