Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@5b6165c4 Add spawnreason for building copper golems (#13112)
PaperMC/Paper@6950f05d Update to 1.21.9
PaperMC/Paper@dad730f2 [ci/skip] Update README
PaperMC/Paper@27f926e7 Expose Copper Golem weathering state to API (#13089)

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

@@ -1,8 +1,8 @@
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftCopperGolem.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftCopperGolem.java
-@@ -13,4 +_,17 @@
-     public net.minecraft.world.entity.animal.coppergolem.CopperGolem getHandle() {
-         return (net.minecraft.world.entity.animal.coppergolem.CopperGolem) this.entity;
+@@ -55,4 +_,17 @@
+             default -> throw new IllegalStateException("Unexpected value: " + oxidizing);
+         }
      }
 +
 +    // Purpur start - Summoner API