Set the default version in apex rule to fix the CI errors reported in b/238399517.
Bug: 238399517
Test: build/bazel/ci/bp2build.sh
Change-Id: Ib0eb89e5b0cca1fe05fecad8b6fe21af607827a4
The code in this directory is experimental. Bazel support for Android Platform is undergoing active development and workflow stability is currently not guaranteed.