[various] Update all packages to Pigeon 26 (#10450)
Pigeon versions <26.0.4 aren't compatible with analyzer 8.x, which is causing conflicts for flutter/flutter, so this updates the entire repo to 26.
Related: https://github.com/flutter/flutter/issues/178270
Manual fixes:
- Updates camera_android_camerax and webview_flutter_android for https://github.com/flutter/packages/pull/9515
- Adds the pigeonVar_* overrides to the url_launcher_windows tests
- Removes equality extensions to Pigeon data classes in in_app_purchase_storekit, as they are now generated by Pigeon, causing redeclaration errors.
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[dependabot]: Bump com.google.ads.interactivemedia.v3:interactivemedia from 3.37.0 to 3.38.0 in /packages/interactive_media_ads/android (#10262)
Bumps com.google.ads.interactivemedia.v3:interactivemedia from 3.37.0 to 3.38.0.
This update created a new base class, AdSlot, and moved most of the methods from CompanionAdSlot to the base class. See https://developers.google.com/interactive-media-ads/docs/sdks/android/client-side/history
Also updates the minSdkVersion to 24 since Flutter 3.35 requires 24 anyways. See https://github.com/flutter/packages/pull/9851
[](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)
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[Gradle 9] Fixed Gradle 9 Deprecations in Packages (#10016)
Fixed all Gradle 9 deprecations in packages repo.
Fixes https://github.com/flutter/flutter/issues/173320
Partially Adresses https://github.com/flutter/flutter/issues/173318
## Pre-Review Checklist
**Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the gemini-code-assist bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.
[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.