Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@8c313fb3 properly override removePassenger for happy ghast
PaperMC/Paper@87d0fdd8 happy ghast is a vehicle
PaperMC/Paper@a38aeef6 fix indices for horse inventories getItem
PaperMC/Paper@96d739c1 rename RegistryFreezeEvent to RegistryComposeEvent
PaperMC/Paper@1102e7b8 fix Equippable#shearSound
PaperMC/Paper@f961ed57 update to rc1
PaperMC/Paper@c3467554 bump built-in datapack version

gradle.properties

@@ -1,8 +1,8 @@
 group = org.purpurmc.purpur
 version = 1.21.6-R0.1-SNAPSHOT
 
-mcVersion = 1.21.6-pre4
-paperCommit = 569c3231fb742fdd79af1d115398c1efae48bd90
+mcVersion = 1.21.6-rc1
+paperCommit = c34675541790bbd245f0cee60793c006bdf773bc
 
 org.gradle.configuration-cache = true
 org.gradle.caching = true

purpur-server/paper-patches/files/src/main/java/org/bukkit/craftbukkit/Main.java.patch

@@ -5,14 +5,14 @@
                          .describedAs("Jar file");
  
 +                // Purpur start - Purpur config files
-+                acceptsAll(asList("purpur", "purpur-settings"), "File for purpur settings")
++                this.acceptsAll(asList("purpur", "purpur-settings"), "File for purpur settings")
 +                    .withRequiredArg()
 +                    .ofType(File.class)
 +                    .defaultsTo(new File("purpur.yml"))
 +                    .describedAs("Yml file");
 +                // Purpur end - Purpur config files
 +
-                 acceptsAll(asList("server-name"), "Name of the server")
+                 this.accepts("server-name", "Name of the server")
                          .withRequiredArg()
                          .ofType(String.class)
 @@ -223,7 +_,7 @@