fix(deps): update dependency flutter_appauth to v12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_appauth (source)	dependencies	major	^8.0.3 → ^12.0.0

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Release Notes

MaikuB/flutter_appauth (flutter_appauth)

v12.1.0

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• [iOS] added custom browser support. Thanks to the PR from Kuurse
• [iOS][macOS] bumped AppAuth IOS SDK dependency to 2.1.0

v12.0.2

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• [iOS][macOS] improved SPM (Swift Package Manager) compatibility

v12.0.1

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• Removed assertion around tied to idTokenHint and postLogoutRedirectUrl parameters passed to the EndSessionRequest constructor. This was done as both are optional according to the OIDC RP-initiated logout specification

v12.0.0

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• Breaking change updated minimum supported SDK version to Flutter 3.38.1/Dart 3.10. Consequently the minimum OS requirements for each platform has been updated as well
  • [Android] minimum Android version is now 7.0 (API level 24)
  • [iOS] minimum iOS version is now 13
  • [macOS] minimum macOS version is now 10.15
• Plugin and example app now adopt UISceneDelegate. Note that whilst migration required Flutter 3.38.0 as a minimum, I have set the minimum supported Flutter SDK version to 3.38.1. This was done as the Dart 3.10 SDK bundled with Flutter 3.38.0 was technically still a beta. The Dart 3.10 SDK bundled with Flutter 3.38.1 is considered stable

v11.0.0

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• Added Prompt class that exposes standard prompt string values as defined in the OIDC specification. Thanks to the PR from Valentin Michalak
• Potentiallu breaking change [Android] plugin will now throw a PlatformException with a null_activity error code when plugin runs into a scenario where the bound Flutter activity has been detached/disposed. Thanks to the PR from Sam Costa

v10.0.0

• Breaking change updated minimum supported SDK version to Flutter 3.29/Dart 3.7
• Bumped flutter_lints dev dependency
• [Android] Breaking changes updated compileSdkVersion to 35 and AGP to 8.6.0
• Updated Android setup section in readme with instructions for apps using Kotlin DSL. Thanks to the PR from LennartMart

v9.0.0

• Breaking change updated minimum supported SDK version to Flutter 3.19/Dart 3.3
• [Android] Breaking changes updated compileSdkVersion to 33 and AGP to 8.0.1 to align with what's used by the AppAuth Android SDK
• [iOS][macOS] added Swift Package Manager support
• [iOS][macOS] Breaking changes a number of Objective-C headers that were public are now no longer public. This means that classes were defined on the native side of the plugin may now no longer visible. These changes likely don't affect users of the plugin as this is to do with APIs that can be accessed via Objective-C or Swift. These changes were done to add Swift Package Manager support
• Migrated Android side of example to use plugin DSL
• Bumped flutter_lints dev dependency
• Fixed typo in the code snippet shown in the End session section of the readme. Thanks to the PR from barryguvenkaya
• Updated readme to add a table of contents
• Updated links to tutorials associated with identity providers. The Auth0 one has been removed as their tutorial has changed to use a different SDK. A disclaimer has been added to warn that the content is managed by external parties and may also be out of date

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[dtoxvanilla1991]

@copilot review dependencies latest fresh official only documentation that are being updated here in PR. Check and validate for any possible migration required and if so, provide detailed minimally viable changes required in a list. If breaking changes are in place, clearly detail them. If there are no changes to be made, leave only 1-2 sentence short overview. No need for detailed specs.

[Copilot]

@copilot review dependencies latest fresh official only documentation that are being updated here in PR. Check and validate for any possible migration required and if so, provide detailed minimally vi...

Official pub.dev changelog and upstream releases show 12.1.0 is the latest stable; the existing ^12.0.0 constraint permits it, and the lockfile already resolves to 12.1.0.

Minimal migration/compatibility items:

• Raise this package’s declared minimum from Dart 3.9.2 / Flutter 3.35.6 to Dart 3.10 / Flutter 3.38.1 (and align the example’s Dart minimum); v12 no longer supports the currently declared floors.
• Ensure consuming apps target Android API 24+, iOS 13+, and macOS 10.15+. The existing iOS/macOS example targets and documented OS minimums already align; verify Android’s minimum is 24. Upstream also identifies Android compile SDK 35 and AGP 8.6.0 as breaking requirements introduced in v10.
• No v12 request/API migration is indicated. The preferEphemeralSession → externalUserAgent change was in v8 and this SDK already uses externalUserAgent. From v11, Android may throw PlatformException with null_activity if the Flutter activity is detached; account for it if handling that lifecycle case. The v9 Objective-C header visibility change is only relevant to consumers accessing those native headers directly.