Allow http when using emulator (#8392)

* Allow http when using emulator

* add changelog

Author: morganchen12

FirebaseStorage/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 8.4.0
+- [fixed] Fixed an issue where Storage could not connect to local emulators using
+  http (#8389).
+
 # 8.3.0
 - [changed] Removed usage of a deprecated GTMSessionFetcher method (#8294).
 

FirebaseStorage/Sources/FIRStorage.m

@@ -363,7 +363,10 @@ - (void)ensureConfigured {
                                                       bucket:_storageBucket
                                                         auth:_auth
                                                     appCheck:_appCheck];
-    _fetcherServiceForApp.allowLocalhostRequest = _usesEmulator;
+    if (_usesEmulator) {
+      _fetcherServiceForApp.allowLocalhostRequest = YES;
+      _fetcherServiceForApp.allowedInsecureSchemes = @[ @"http" ];
+    }
   }
 }