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-api/paper-patches/files/src/main/java/org/bukkit/entity/CopperGolem.java.patch

@@ -1,9 +1,9 @@
 --- a/src/main/java/org/bukkit/entity/CopperGolem.java
 +++ b/src/main/java/org/bukkit/entity/CopperGolem.java
-@@ -3,4 +_,19 @@
- import io.papermc.paper.entity.Shearable;
+@@ -39,6 +_,22 @@
+      */
+     void setOxidizing(Oxidizing oxidizing);
  
- public interface CopperGolem extends Golem, Shearable {
 +    // Purpur start
 +    /**
 +     * Get the player that summoned this iron golem
@@ -19,4 +19,7 @@
 +     */
 +    void setSummoner(@org.jetbrains.annotations.Nullable java.util.UUID summoner);
 +    // Purpur end
- }
++
+     /**
+      * Represents the oxidizing state of a copper golem.
+      *