Update rules_go calls to match Envoy WORKSPACE

[isaacd9]

Currently, when trying to build the //:envoy target as described in the README, the build fails immediately with:

INFO: Invocation ID: 70b43f0a-bebd-4eb0-ac07-3fcc68e499af
ERROR: Failed to load Starlark extension '@io_bazel_rules_go_compat//:compat.bzl'.
It usually happens when the repository is not defined prior to being used.
Maybe repository 'io_bazel_rules_go_compat' was defined later in your WORKSPACE file?
ERROR: cycles detected during target parsing
INFO: Elapsed time: 9.699s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)

This PR updates the rules_go directives in the WORKSPACE of this repository to match those of Envoy at HEAD of master and should fix the build.