Replace MCAuth with RK_01 MinecraftAuth

auth/build.gradle.kts

@@ -0,0 +1,20 @@
+plugins {
+    id("mcprotocollib.publish-conventions")
+}
+
+version = "2.0.0-SNAPSHOT"
+description = "A library for authentication with Minecraft accounts."
+
+dependencies {
+    // Gson
+    api(libs.gson)
+
+    // MinecraftAuth for authentication
+    api(libs.minecraftauth)
+
+    // Checker Framework
+    api(libs.checkerframework.qual)
+
+    // Test dependencies
+    testImplementation(libs.junit.jupiter)
+}