fix(backend): fix type error(s) in security fixes (#15009)

* Fix type error in security fixes

(cherry picked from commit fa3cf6c299)

* Fix error in test function calls

(cherry picked from commit 1758f29364)

* Fix style error

(cherry picked from commit 23c4aa2571)

* Fix another style error

(cherry picked from commit 36af07abe2)

* Fix `.punyHost` misuse

(cherry picked from commit 6027b516e1)

* attempt to fix test: make yaml valid

---------

Co-authored-by: Julia Johannesen <julia@insertdomain.name>

packages/backend/src/core/RemoteUserResolveService.ts

@@ -54,7 +54,7 @@ export class RemoteUserResolveService {
 			}) as MiLocalUser;
 		}
 
-		host = this.utilityService.punyHost(host);
+		host = this.utilityService.toPuny(host);
 
 		if (host === this.utilityService.toPuny(this.config.host)) {
 			this.logger.info(`return local user: ${usernameLower}`);