scripted-diff: Use getInt<T> over get_int/get_int64

-BEGIN VERIFY SCRIPT-
 sed -i 's|\<get_int64\>|getInt<int64_t>|g' $(git grep -l get_int ':(exclude)src/univalue')
 sed -i 's|\<get_int\>|getInt<int>|g'       $(git grep -l get_int ':(exclude)src/univalue')
-END VERIFY SCRIPT-

src/rpc/output_script.cpp

@@ -124,7 +124,7 @@ static RPCHelpMan createmultisig()
                 },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
         {
-            int required = request.params[0].get_int();
+            int required = request.params[0].getInt<int>();
 
             // Get the public keys
             const UniValue& keys = request.params[1].get_array();