Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@ff251e4 Use reference hash set in reference Holder (#11363)
PaperMC/Paper@691d452 Fix bundled spark permission check (#11355)
PaperMC/Paper@012c527 Update Velocity natives (#11347)
PaperMC/Paper@953e6e9 Fire BlockExpEvent on grindstone use (#11346)
PaperMC/Paper@10f5879 Change condition check order of entity tracking Y (#11348)
PaperMC/Paper@805a974 Improve console completion with brig suggestions (#9251)
PaperMC/Paper@e0021b1 Fix allowSpiderWorldBorderClimbing world config (#11321)
PaperMC/Paper@3db4758 Check dead flag in isAlive() (#11330)

gradle.properties

@@ -2,7 +2,7 @@ group = org.stupidcraft.linearpaper
 version = 1.21.1-R0.1-SNAPSHOT
 
 mcVersion = 1.21.1
-paperCommit = b483da4e026ad078c9b1dd6e1e5ec25ac450df69
+paperCommit = 3db475838f8341f0db0efee0843755864b2241fa
 
 org.gradle.caching = true
 org.gradle.parallel = true