Allow http schemes when using the auth emulator (#7350)

* Allow http schemes when using the auth emulator.

* Update changelog and fix formatting.

* Update changelog.

Author: rosalyntan

FirebaseAuth/CHANGELOG.md

@@ -1,3 +1,6 @@
+# Unreleased
+- [fixed] Auth emulator now works across the local network. (#7350)
+
 # 7.4.0
 - [fixed] Check if the reverse client ID is configured as a custom URL scheme before setting it as the callback scheme. (#7211)
 - [added] Add ability to sync auth state across devices. (#6924)

FirebaseAuth/Sources/Backend/FIRAuthBackend.m

@@ -654,6 +654,7 @@ - (void)asyncPostToURLWithRequestConfiguration:(FIRAuthRequestConfiguration *)re
   NSString *emulatorHostAndPort = requestConfiguration.emulatorHostAndPort;
   if (emulatorHostAndPort) {
     fetcher.allowLocalhostRequest = YES;
+    fetcher.allowedInsecureSchemes = @[ @"http" ];
   }
   fetcher.bodyData = body;
   [fetcher beginFetchWithCompletionHandler:handler];