chore(deps): update dependency firebase/firebase-ios-sdk to from: "11.8.1" (#1473)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[firebase/firebase-ios-sdk](https://redirect.github.com/firebase/firebase-ios-sdk)
| patch | `from: "11.8.0"` -> `from: "11.8.1"` |

---

### Release Notes

<details>
<summary>firebase/firebase-ios-sdk (firebase/firebase-ios-sdk)</summary>

###
[`v11.8.1`](https://redirect.github.com/firebase/firebase-ios-sdk/releases/tag/11.8.1):
Firebase Apple 11.8.1

[Compare
Source](https://redirect.github.com/firebase/firebase-ios-sdk/compare/11.8.0...11.8.1)

The Firebase Apple SDK (11.8.1) is now available. For more details, see
the [Firebase Apple SDK release
notes.](https://firebase.google.com/support/release-notes/ios#11.8.1)

To install this SDK, see [Add Firebase to your
project.](https://firebase.google.com/docs/ios/setup)

Note the fix in this release is only applicable to the Swift Package
Manager and CocoaPods distributions.

#### What's Changed

- Suppress deprecation build warning introduced in 11.8.0 by
[@&#8203;paulb777](https://redirect.github.com/paulb777) in
[https://github.com/firebase/firebase-ios-sdk/pull/14425](https://redirect.github.com/firebase/firebase-ios-sdk/pull/14425)

**Full Changelog**:
firebase/firebase-ios-sdk@11.8.0...11.8.1

</details>

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examples/firebase_example/Package.swift

@@ -5,7 +5,7 @@ import PackageDescription
 let package = Package(
     name: "firebase_example",
     dependencies: [
-        .package(url: "https://github.com/firebase/firebase-ios-sdk", .upToNextMajor(from: "11.8.0")),
+        .package(url: "https://github.com/firebase/firebase-ios-sdk", .upToNextMajor(from: "11.8.1")),
         // Used by crashlytics example
         .package(url: "https://github.com/ashleymills/Reachability.swift.git", .upToNextMajor(from: "5.2.4")),
     ]