Add Guava dependency to deob-ast

Not sure how this worked - perhaps we picked it up transitively.

Signed-off-by: Graham <gpe@openrs2.dev>

deob-ast/build.gradle.kts

@@ -13,6 +13,7 @@ dependencies {
 
     implementation(project(":util"))
     implementation("com.github.javaparser:javaparser-symbol-solver-core:${Versions.javaParser}")
+    implementation("com.google.guava:guava:${Versions.guava}")
     implementation("org.jdom:jdom2:${Versions.jdom}")
 }