Exclude GSON from being shaded when shading adventure on the spigot module.

build.gradle

@@ -25,7 +25,10 @@ subprojects {
 
     project.ext.nettyVersion = '4.1.72.Final'
     project.ext.adventureVersion = '4.10.1'
-    project.ext.adventureDependencies=["net.kyori:adventure-api:${adventureVersion}", "net.kyori:adventure-text-serializer-gson:${adventureVersion}", "net.kyori:adventure-text-serializer-legacy:${adventureVersion}", "net.kyori:adventure-nbt:${adventureVersion}"]
+    project.ext.adventureDependencies=["net.kyori:adventure-api:${adventureVersion}",
+                                       "net.kyori:adventure-text-serializer-gson:${adventureVersion}",
+                                       "net.kyori:adventure-text-serializer-legacy:${adventureVersion}",
+                                       "net.kyori:adventure-nbt:${adventureVersion}"]
 
     repositories {
         mavenLocal()

spigot/build.gradle

@@ -11,6 +11,9 @@ java.targetCompatibility = JavaVersion.VERSION_1_8
 shadowJar {
     relocate 'net.kyori.adventure.text.serializer', 'io.github.retrooper.packetevents.adventure.serializer'
     relocate 'net.kyori.adventure.util.Codec', 'io.github.retrooper.packetevents.adventure.util.Codec'
+    dependencies {
+        exclude(dependency('com.google.code.gson:gson:2.8.0'))
+    }
 }
 
 dependencies {