Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@8de7e356 Add null check to level ref in Entity constructor (#12218)
PaperMC/Paper@a866e366 Fix MenuType.SMITHING JavaDocs (#12226)
PaperMC/Paper@5538d24d Fix "DEFAULT" SpawnReason of fish spawned by bucket (#12227)

Author: granny

gradle.properties

@@ -2,7 +2,7 @@ group = org.purpurmc.purpur
 version = 1.21.4-R0.1-SNAPSHOT
 
 mcVersion = 1.21.4
-paperCommit = 1d5e5a57e919d7d7b79cdd36e5194f63fc55cdce
+paperCommit = 5538d24d72a418491b80e89d6f7710548ac46687
 
 org.gradle.configuration-cache = true
 org.gradle.caching = true