Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@21f125f Revert velocity natives to 3.1.2 (#11368)
PaperMC/Paper@0e82527 Fix NPE while trying to respawn an already disconnected player (#11353)
PaperMC/Paper@5d91bef Fix shulkerbox loot table replenish (#11366)
PaperMC/Paper@a8e6a93 Deprecate for removal all OldEnum-related methods (#11371)
PaperMC/Paper@925c3b9 Add FeatureFlag API (#8952)

gradle.properties

@@ -2,7 +2,7 @@ group = org.stupidcraft.linearpaper
 version = 1.21.1-R0.1-SNAPSHOT
 
 mcVersion = 1.21.1
-paperCommit = 3db475838f8341f0db0efee0843755864b2241fa
+paperCommit = 925c3b9d2b4a4a1c0a6ea4dc2b06f4009cde02aa
 
 org.gradle.caching = true
 org.gradle.parallel = true