[Firebase AI] Switch to SemVer tagged firebase-ios-sdk

Author: andrewheard

firebaseai/FirebaseAIExample.xcodeproj/project.pbxproj

@@ -614,8 +614,8 @@
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/firebase/firebase-ios-sdk.git";
 			requirement = {
-				branch = main;
-				kind = branch;
+				kind = upToNextMajorVersion;
+				minimumVersion = 11.13.0;
 			};
 		};
 /* End XCRemoteSwiftPackageReference section */