Update utils.js (#2981)

Fixed following error

    ReferenceError: TextEncoder is not defined

Author: sudarshanvn

packages/pg/lib/crypto/utils.js

@@ -1,5 +1,5 @@
 'use strict'
-
+const { TextEncoder, TextDecoder } = require('util');
 const useLegacyCrypto = parseInt(process.versions && process.versions.node && process.versions.node.split('.')[0]) < 15
 if (useLegacyCrypto) {
   // We are on an old version of Node.js that requires legacy crypto utilities.