Update protoc-gen-validate to latest HEAD (3204975) (#497)
Update protoc-gen-validate to latest HEAD (3204975) (#497)

This update brings in
https://github.com/lyft/protoc-gen-validate/pull/59 which will allow
envoy/data-plane-api to build using a newer version of rules_go.
Necessary for https://github.com/envoyproxy/envoy/issues/2578

Signed-off-by: Snow Pettersen <18824beaba694b0802bee531b635db27ba08e6bb@squareup.com>
jrajahalme/envoy-api,jrajahalme/envoy-api,jrajahalme/envoy-api,jrajahalme/envoy-api,lyft/envoy-api,lyft/envoy-api,lyft/envoy-api