Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
PaperMC/Paper@f8beab5 correct argument check in PlayerHandshakeEvent#setFailMessage(String) (#7940)
PaperMC/Paper@c80df84 Readd remove vec allocations diff (#7930)
PaperMC/Paper@1ccff4f Readd mc-4 fix
PaperMC/Paper@d7165b0 Fix some references to obfuscated code
PaperMC/Paper@55201f0 Updated Upstream (Bukkit/CraftBukkit) (#7936)

patches/server/0021-Alternative-Keepalive-Handling.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Alternative Keepalive Handling
 
 
 diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
-index 487ce0230306fbfc78bc604e0a6ce202df628382..1f7dbc3c773179a21f8b11c455ef9f4fa1971048 100644
+index 6f5fb1ac8440f2174ce52f318b7d2345ce82ace6..bced7bd90f8bc4c7655b5f1fc2168486ee45352a 100644
 --- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
 +++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
 @@ -245,6 +245,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
@@ -52,7 +52,7 @@ index 487ce0230306fbfc78bc604e0a6ce202df628382..1f7dbc3c773179a21f8b11c455ef9f4f
 +            }
 +        } else
 +        // Purpur end
-         //PlayerConnectionUtils.ensureMainThread(packetplayinkeepalive, this, this.player.getWorldServer()); // CraftBukkit // Paper - This shouldn't be on the main thread
+         //PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel()); // CraftBukkit // Paper - This shouldn't be on the main thread
          if (this.keepAlivePending && packet.getId() == this.keepAliveChallenge) {
              int i = (int) (Util.getMillis() - this.keepAliveTime);
 diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java