message: Use latest kythe for CI testing.
diff: @@ -41,4 +41,4 @@ export USE_BAZEL_VERSION=$BAZEL_VERSION
  # TODO(b/171989992): revert to using release version after upgrading system
  # libraries/image (need: GLIBCXX_3.4.26, CXXABI_1.3.11, GLIBC_2.29).
  # KYTHE_VERSION=master
  -export KYTHE_VERSION=v0.0.48
  +export KYTHE_VERSION=v0.0.52
  