build: bump googletest version. (#4293)

This gives us working --test_filter and general improvements.

Signed-off-by: Harvey Tuch <[email protected]>

bazel/repository_locations.bzl

@@ -109,7 +109,7 @@ REPOSITORY_LOCATIONS = dict(
         strip_prefix = "twitter.common.finagle-thrift-0.3.9/src",
     ),
     com_google_googletest = dict(
-        commit = "43863938377a9ea1399c0596269e0890b5c5515a",
+        commit = "3d5612182581df64acc12d2633e473decf5adc47",  # Aug 29, 2018
         remote = "https://github.com/google/googletest",
     ),
     com_google_protobuf = dict(