Chore: fix invalid type name on TS file (#21814)

app/meteor-accounts-saml/server/lib/Utils.ts

@@ -10,7 +10,7 @@ import { StatusCode } from './constants';
 
 // @ToDo remove this ts-ignore someday
 // @ts-ignore skip checking if Logger exists to avoid having to import the Logger class here (it would bring a lot of baggage with its dependencies, affecting the unit tests)
-type NullableLogger = Logger | Null;
+type NullableLogger = Logger | null;
 
 let providerList: Array<IServiceProviderOptions> = [];
 let debug = false;