pc: Fix 1.21 enchant_item button id integer type to varint (#1201)

ServerboundContainerButtonClickPacket (minecraft-data packet_enchant_item) was reworked
in 1.21 to encode the button id as a VarInt. The vanilla codec is
StreamCodec.composite(CONTAINER_ID/VAR_INT, ::containerId, VAR_INT, ::buttonId). mcdata
updated windowId to ContainerID (varint) for 1.21+ but left enchantment (the button id)
as i8.

Before 1.21 both fields were a single byte (readByte/writeByte), so i8 is correct there;
this only affects 1.21.1-1.21.11.

A VarInt and a byte encode identically for button ids below 128, so it seldom breaks, but
a button id >= 128 (e.g. a stonecutter/loom recipe index on a server with many recipes)
needs a 2-byte VarInt that an i8 writer cannot represent. Serverbound.

Verified against the Mojang server jars: byte/byte in 1.19.4, VAR_INT button id in 1.21.1
and 1.21.3-1.21.9.

proto.yml edited, protocol.json regenerated with npm run build.

Author: atiweb

data/pc/1.21.1/proto.yml

@@ -2702,7 +2702,7 @@
    # MC: ServerboundContainerButtonClickPacket
    packet_enchant_item:
       windowId: ContainerID
-      enchantment: i8
+      enchantment: varint
    # MC: ServerboundContainerClickPacket
    packet_window_click:
       windowId: ContainerID

data/pc/1.21.1/protocol.json

@@ -7783,7 +7783,7 @@
             },
             {
               "name": "enchantment",
-              "type": "i8"
+              "type": "varint"
             }
           ]
         ],

data/pc/1.21.11/protocol.json

@@ -10539,7 +10539,7 @@
             },
             {
               "name": "enchantment",
-              "type": "i8"
+              "type": "varint"
             }
           ]
         ],

data/pc/1.21.3/proto.yml

@@ -2855,7 +2855,7 @@
    # MC: ServerboundContainerButtonClickPacket
    packet_enchant_item:
       windowId: ContainerID
-      enchantment: i8
+      enchantment: varint
    # MC: ServerboundContainerClickPacket
    packet_window_click:
       windowId: ContainerID

data/pc/1.21.3/protocol.json

@@ -8323,7 +8323,7 @@
             },
             {
               "name": "enchantment",
-              "type": "i8"
+              "type": "varint"
             }
           ]
         ],

data/pc/1.21.4/proto.yml

@@ -2859,7 +2859,7 @@
    # MC: ServerboundContainerButtonClickPacket
    packet_enchant_item:
       windowId: ContainerID
-      enchantment: i8
+      enchantment: varint
    # MC: ServerboundContainerClickPacket
    packet_window_click:
       windowId: ContainerID

data/pc/1.21.4/protocol.json

@@ -8345,7 +8345,7 @@
             },
             {
               "name": "enchantment",
-              "type": "i8"
+              "type": "varint"
             }
           ]
         ],

data/pc/1.21.5/proto.yml

@@ -2979,7 +2979,7 @@
    # MC: ServerboundContainerButtonClickPacket
    packet_enchant_item:
       windowId: ContainerID
-      enchantment: i8
+      enchantment: varint
    # MC: ServerboundContainerClickPacket
    packet_window_click:
       windowId: ContainerID

data/pc/1.21.5/protocol.json

@@ -8744,7 +8744,7 @@
             },
             {
               "name": "enchantment",
-              "type": "i8"
+              "type": "varint"
             }
           ]
         ],

data/pc/1.21.6/proto.yml

@@ -3076,7 +3076,7 @@
    # MC: ServerboundContainerButtonClickPacket
    packet_enchant_item:
       windowId: ContainerID
-      enchantment: i8
+      enchantment: varint
    # MC: ServerboundContainerClickPacket
    packet_window_click:
       windowId: ContainerID