lang: Deprecate `#[state]` (#661)

lang/attribute/state/src/lib.rs

@@ -23,6 +23,10 @@ use syn::parse_macro_input;
 /// ```
 ///
 /// For more, see the [`account`](./attr.account.html) attribute.
+#[deprecated(
+    since = "0.14.0",
+    note = "#[state] will be removed in a future version. Use a PDA with static seeds instead",
+)]
 #[proc_macro_attribute]
 pub fn state(
     args: proc_macro::TokenStream,