chore: update fips check

Co-authored-by: Filip Skokan <panva.ip@gmail.com>

Author: adamjmcgrath

lib/oaep.js

@@ -7,7 +7,7 @@ var crypto = require('crypto');
 // this is not a FIPS valid code path.
 
 function assertShimAllowed() {
-  if (typeof crypto.getFips === 'function' && crypto.getFips()) {
+  if (crypto.getFips?.()) {
     var err = new Error('unsupported cryptographic operation');
     err.code = 'ERR_XMLENC_FIPS_UNSUPPORTED';
     throw err;