Bump Bazel version to 0.27.0 rc5

This is needed to fix Bazel CI build breakage on Mac OS. See these
issues for more details: [1], [2].

[1] https://github.com/bazelbuild/bazel/issues/8536
[2] https://github.com/bazelbuild/continuous-integration/issues/724

Change-Id: Ib879ccd375b19dc2e8d4d4e6e567629b7d35636d
diff --git a/.bazelversion b/.bazelversion
index b2525e3..cffeade 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-0.27.0rc3
\ No newline at end of file
+0.27.0rc5
\ No newline at end of file