fix(typescript): work around potentially missing global URL from DOM lib

This is a workaround for DefinitelyTyped/DefinitelyTyped#34960

closes #295

src/jwks/remote.ts

@@ -67,7 +67,7 @@ function isJWKLike(key: unknown) {
 }
 
 class RemoteJWKSet {
- private _url: URL
+ private _url: globalThis.URL
 
  private _timeoutDuration: number
 
@@ -83,7 +83,7 @@ class RemoteJWKSet {
 
  private _options: Pick<RemoteJWKSetOptions, 'agent'>
 
- constructor(url: URL, options?: RemoteJWKSetOptions) {
+ constructor(url: unknown, options?: RemoteJWKSetOptions) {
  if (!(url instanceof URL)) {
  throw new TypeError('url must be an instance of URL')
  }
@@ -212,6 +212,10 @@ class RemoteJWKSet {
  }
 }
 
+interface URL {
+ href: string
+}
+
 /**
  * Returns a function that resolves to a key object downloaded from a
  * remote endpoint returning a JSON Web Key Set, that is, for example,