Unable to build project with "Enhanced Security" from Xcode26

### Description

When I enabled the “Enhanced Security” configuration in Xcode 26, I encountered an issue while attempting to build my project.

### Reproducing the issue

- Open Xcode project settings with Xcode26
- Signing & Capabilities
- Click on +Capability
- Enhanced Security
- Try to build project

### Firebase SDK Version

11.14.0

### Xcode Version

26 beta 1

### Installation Method

Swift Package Manager

### Firebase Product(s)

Messaging

### Targeted Platforms

iOS

### Relevant Log Output

```shell
Undefined symbols for architecture arm64e:
"_OBJC_CLASS_$_FIRApp", referenced from:
in AppDelegate.o
"_OBJC_CLASS_$_FIRMessaging", referenced from:
in AppDelegate.o
```

### If using Swift Package Manager, the project's Package.resolved

Expand Package.resolved snippet

```json

Replace this line with the contents of your Package.resolved.

```

### If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

```yml

Replace this line with the contents of your Podfile.lock!

```