Update GitHub URL for failing android_semantics_integration_test bringup (#160993)

This should have been marked unflaky when
https://github.com/flutter/flutter/issues/124636 was fixed with
https://github.com/flutter/flutter/pull/127128. However it wasn't, and
is now failing on a legit behavior change the test caught.

The test is now failing due to
https://github.com/flutter/flutter/issues/153594, and if this test
hadn't been marked flaky the commit in question would closed the tree
and been reverted.