Remove build_tools_version and api_level (#562)
Remove build_tools_version and api_level (#562)

Remove `build_tools_version` and `api_level` to let `android_sdk_repository` automatically select the latest installed version.

One of the fixes for https://github.com/bazelbuild/bazel/issues/13409#issuecomment-845265150
bazelbuild/rules_jvm_external,bazelbuild/rules_jvm_external,bazelbuild/rules_jvm_external