crypto: drop Math.pow(), use static exponentation

PR-URL: #20816
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: bnoordhuis

lib/internal/crypto/random.js

@@ -11,7 +11,7 @@ const {
 const { isArrayBufferView } = require('internal/util/types');
 
 const { kMaxLength } = require('buffer');
-const kMaxUint32 = Math.pow(2, 32) - 1;
+const kMaxUint32 = 2 ** 32 - 1;
 const kMaxPossibleLength = Math.min(kMaxLength, kMaxUint32);
 
 function assertOffset(offset, elementSize, length) {