ci: Bump Maestro to 2.7.0 for the critical UI tests

Update Maestro from 2.1.0 to the latest release to pick up Android driver
install fixes, which may help the flaky APK install on the API 37 emulator.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: runningcode

.github/workflows/integration-tests-ui-critical.yml

@@ -15,7 +15,7 @@ env:
   BUILD_PATH: "build/outputs/apk/release"
   APK_NAME: "sentry-uitest-android-critical-release.apk"
   APK_ARTIFACT_NAME: "sentry-uitest-android-critical-release"
-  MAESTRO_VERSION: "2.1.0"
+  MAESTRO_VERSION: "2.7.0"
 
 jobs:
   build: