Deprecate Instruction::new (#15695)

sdk/program/src/instruction.rs

@@ -211,6 +211,10 @@ pub struct Instruction {
 }
 
 impl Instruction {
+    #[deprecated(
+        since = "1.6.0",
+        note = "Please use another `Instruction constructor instead"
+    )]
     pub fn new<T: Serialize>(program_id: Pubkey, data: &T, accounts: Vec<AccountMeta>) -> Self {
         Self::new_with_bincode(program_id, data, accounts)
     }