flogger fails to build with Bazel @ head from July 17 onward

[aiuto]

(21:31:16) ERROR: Analysis of target '//google:src/test/java/com/google/common/flogger/GoogleLoggerTest' failed; build aborted: Android SDK api level 29 was requested but it is not installed in the Android SDK at /opt/android-sdk-linux. The api levels found were [28, 24]. Please choose an available api level or install api level 29 from the Android SDK Manager.

Last good daily
https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/1571

Things went bad after 4c9b72a936607781457bc0324b1b44b4c28fad89
and before cf3a9236f8af53a61c4b89546611029f35779481

Quick link to that activity period: https://github.com/bazelbuild/bazel/commits/master?after=d394250a971f0f8ee97797844f6e09133b5e1605+209&branch=master

My hunch is that the best PRs to look at for clues are:
bazelbuild/bazel@1e00502
bazelbuild/bazel@20b95dd

[cpovirk]

(Breadcrumbs: The linked issue has some discussion, as do bazelbuild/continuous-integration#1006 and google/bazel-common#114.)