Update dependency app_settings to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
app_settings	dependencies	major	7.0.0 → 8.0.0	8.0.3 (+2)

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Release Notes

spencerccf/app_settings (app_settings)

v8.0.0

• BREAKING: Drop CocoaPods support for iOS and macOS. Consuming apps must build with Swift Package Manager (supported by Flutter 3.24+); remove ios/app_settings.podspec and macos/app_settings.podspec.
• fix: macOS plugin now ships its real implementation (AppSettingsPlugin.swift, AppSettingsEnums.swift) through the Swift Package Manager Sources layout instead of the old Classes/ CocoaPods-only source set.
• fix: bundle PrivacyInfo.xcprivacy correctly for both iOS and macOS SPM targets (the iOS Package.swift previously pointed at a resource path Xcode rejected as "unhandled").
• Add an explicit FlutterFramework package dependency to both Package.swift files, per Flutter's current Swift Package Manager plugin-authoring guidance.
• Example app: remove Podfile/Podfile.lock/Pods/ for iOS and macOS; Xcode projects now resolve plugins via Swift Package Manager only.
• Remove dead, non-functional getPlatformVersion() leftover from the original plugin template (lib/app_settings_method_channel.dart, lib/src/app_settings.dart) — it was never implemented on any platform and always threw MissingPluginException.
• Rewrite unit tests (test/app_settings_test.dart, test/app_settings_method_channel_test.dart) to exercise real openAppSettings/openAppSettingsPanel behavior instead of stale, throwing mocks.
• Example app: only show the "openAppSettingsPanel() options" section on Android, since settings panels are an Android Q+ feature.
• Update Android Gradle Plugin (8.7.3 -> 8.11.1), Kotlin (2.1.0 -> 2.2.20), and the Gradle wrapper (8.12 -> 8.14) in the example app to clear Flutter's outdated-toolchain warnings; align the plugin's own android/build.gradle kotlin_version/gradle_version to match.

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