refactor: avoid use of prototype attributes in keystore queries (#660)

Co-authored-by: Patrick Nappa <patrick.nappa@kashcade.com>

Author: pnappa

lib/helpers/issuer.js

@@ -75,6 +75,7 @@ async function queryKeyStore({ kid, kty, alg, use }, { allowMulti = false } = {}
     ignoreUnknown: true,
     unorderedArrays: true,
     unorderedSets: true,
+    respectType: false,
   });
 
   // refresh keystore on every unknown key but also only upto once every minute