Upgrades agp versions and lockfiles for `dev/`. Also changes the lockfile generation script to represent the newer form of the `settings.gradle` template, and therefore also propagates these changes.
~~Potentially related to https://github.com/flutter/flutter/issues/134419~~, but worth doing anyways. (not actually related)
Unpins flutter_plugin_android_lifecycle where it is pinned. I then
1. ran `flutter update-packages --force-upgrade` (but only committed the changes within `dev/integration_tests/gradle_deprecated_settings/`, which is where it had been pinned)
2. followed by `./gradlew :generateLockfiles` from `dev/integration_tests/gradle_deprecated_settings/android/` (the lockfile was what was causing the CI dependency resolution failure, so this second step is the fix for that).
See the reason it was pinned: https://github.com/flutter/flutter/pull/121847#discussion_r1124797112 followed by the PR that pinned it: https://github.com/flutter/flutter/pull/122043
Fixes https://github.com/flutter/flutter/issues/122039
