Mark old @ExpectPlatform for removal (2.0)

common/src/main/java/me/shedaniel/architectury/ExpectPlatform.java

@@ -19,6 +19,8 @@
 
 package me.shedaniel.architectury;
 
+import org.jetbrains.annotations.ApiStatus;
+
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -30,5 +32,6 @@ import java.lang.annotation.Target;
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)
 @Deprecated
+@ApiStatus.ScheduledForRemoval(inVersion = "2.0")
 public @interface ExpectPlatform {
-}
+}