Downgrade Swift again, because it breaks a Bazel test
Downgrade Swift again, because it breaks a Bazel test

Change-Id: I47eb82c50a2a88371c13400eaba218cd37063689

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration