Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@51d28af8 [ci/skip] Typo in CartographyInventory (#12777)
PaperMC/Paper@6ea679eb Allow listening to plugin messages during configuration phase (#12775)
PaperMC/Paper@c3be00f0 Always call plugin message dispatch on PlayerConnection
PaperMC/Paper@3fec37a9 Move the double call into the dispatch method
PaperMC/Paper@108255cb Reduce PlayerLoginEvent alt behavior nag for now (#12782)
PaperMC/Paper@2141ca52 Port plugins command to brigadier (#12632)
PaperMC/Paper@0cadaefc Fix quitmessage nullability issues (#12783)

purpur-server/minecraft-patches/sources/net/minecraft/server/network/ServerCommonPacketListenerImpl.java.patch

@@ -13,15 +13,18 @@
      private volatile int latency; // Paper - improve keepalives - make volatile
      private final io.papermc.paper.util.KeepAlive keepAlive; // Paper - improve keepalives
      private volatile boolean suspendFlushingOnServerThread = false;
-@@ -53,6 +_,7 @@
+@@ -53,6 +_,10 @@
      public final java.util.Map<java.util.UUID, net.kyori.adventure.resource.ResourcePackCallback> packCallbacks = new java.util.concurrent.ConcurrentHashMap<>(); // Paper - adventure resource pack callbacks
      private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
      protected static final net.minecraft.resources.ResourceLocation MINECRAFT_BRAND = net.minecraft.resources.ResourceLocation.withDefaultNamespace("brand"); // Paper - Brand support
-+    protected static final net.minecraft.resources.ResourceLocation PURPUR_CLIENT = net.minecraft.resources.ResourceLocation.fromNamespaceAndPath("purpur", "client"); // Purpur - Purpur client support
-     public @Nullable String playerBrand; // Paper
- 
-     public ServerCommonPacketListenerImpl(MinecraftServer server, Connection connection, CommonListenerCookie cookie) {
-@@ -94,6 +_,18 @@
++    // Purpur start - Purpur client support
++    protected static final net.minecraft.resources.ResourceLocation PURPUR_CLIENT = net.minecraft.resources.ResourceLocation.fromNamespaceAndPath("purpur", "client");
++    public boolean purpurClient;
++    // Purpur end - Purpur client support
+     // Paper start - retain certain values
+     public @Nullable String playerBrand;
+     public final java.util.Set<String> pluginMessagerChannels;
+@@ -98,6 +_,18 @@
          // Paper start - improve keepalives
          long now = System.nanoTime();
          io.papermc.paper.util.KeepAlive.PendingKeepAlive pending = this.keepAlive.pendingKeepAlives.peek();
@@ -40,7 +43,20 @@
          if (pending != null && pending.challengeId() == packet.getId()) {
              this.keepAlive.pendingKeepAlives.remove(pending);
  
-@@ -179,6 +_,23 @@
+@@ -172,6 +_,12 @@
+                 return;
+             }
+ 
++            // Purpur start - Purpur client support
++            if (identifier.equals(PURPUR_CLIENT)) {
++                this.purpurClient = true;
++            }
++            // Purpur end - Purpur client support
++
+             if (identifier.equals(MINECRAFT_BRAND)) {
+                 this.playerBrand = new net.minecraft.network.FriendlyByteBuf(io.netty.buffer.Unpooled.wrappedBuffer(data)).readUtf(256);
+             }
+@@ -251,6 +_,23 @@
          Profiler.get().push("keepAlive");
          long millis = Util.getMillis();
          // Paper start - improve keepalives

purpur-server/minecraft-patches/sources/net/minecraft/server/network/ServerGamePacketListenerImpl.java.patch

@@ -231,16 +231,3 @@
              LOGGER.warn(
                  "Player {} tried to change game mode to {} without required permissions",
                  this.player.getGameProfile().getName(),
-@@ -3747,6 +_,12 @@
-                 readChannelIdentifier(data, startIndex, data.length, registerChannel);
-                 return;
-             }
-+
-+            // Purpur start - Purpur client support
-+            if (identifier.equals(PURPUR_CLIENT)) {
-+               this.player.purpurClient = true;
-+            }
-+            // Purpur end - Purpur client support
- 
-             if (identifier.equals(MINECRAFT_BRAND)) {
-                 this.player.connection.playerBrand = new net.minecraft.network.FriendlyByteBuf(io.netty.buffer.Unpooled.wrappedBuffer(data)).readUtf(256);