Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@20ec622 use correct types for preloading CraftRegistry

Author: granny

gradle.properties

@@ -2,7 +2,7 @@ group = org.purpurmc.purpur
 version = 1.21.1-R0.1-SNAPSHOT
 
 mcVersion = 1.21.1
-paperCommit = 1bc02e6b23bf18ba43054bf978769411bd96a04d
+paperCommit = 20ec62255da0374efed5026600321f715ad94282
 
 org.gradle.caching = true
 org.gradle.parallel = true