bump protoc-gen-validate to latest (#7641)

Description:

this commit bumps protoc-gen-validate to the latest version. this
should unblock `wrowe` in slack working on windows support.

after this I believe we can also take use of the new address validation
type to fix some unique error messages, but the first step is bumping it

as a side note:

- SocketState was using `.message.required` however it was not
  a message type. as far as I can tell this was a bug that PGV fixed.

Risk Level: Low
Testing: Ensure that envoy successfully builds.
Docs Changes: None
Release Notes: None

Signed-off-by: Cynthia Coan <ccoan@instructure.com>

Mirrored from https://github.com/envoyproxy/envoy @ 9c00735e68148b9100473eecce2ee536c3072c6b

bazel/repository_locations.bzl

@@ -7,8 +7,8 @@ GOGOPROTO_SHA256 = "99e423905ba8921e86817607a5294ffeedb66fdd4a85efce5eb2848f715f
 OPENCENSUS_PROTO_GIT_SHA = "d5d80953a8c2ff4633087af6933cd152678434bb"  # Mar 18, 2019
 OPENCENSUS_PROTO_SHA256 = "a4e87a1da21d1b3a16674332c3ee6e2689d52f3532e2ff8cb4a626c8bcdabcfc"
 
-PGV_GIT_SHA = "26db5cb7c01a67c6a2e21a832106406185530b2f"
-PGV_SHA256 = "6510cbcf69d99059c652ae2376f6240bc761d0b019cd962225f4f609be361e26"
+PGV_GIT_SHA = "dd90514d96e35023ed20201f349542b0bc64461d"
+PGV_SHA256 = "f7d67677fbec5b0f561f6ee6788223fb535d3864b53a28b6678e319f5d1f4f25"
 
 GOOGLEAPIS_GIT_SHA = "d642131a6e6582fc226caf9893cb7fe7885b3411"  # May 23, 2018
 GOOGLEAPIS_SHA = "16f5b2e8bf1e747a32f9a62e211f8f33c94645492e9bbd72458061d9a9de1f63"

envoy/api/v2/core/base.proto

@@ -258,8 +258,7 @@ message SocketOption {
   }
   // The state in which the option will be applied. When used in BindConfig
   // STATE_PREBIND is currently the only valid value.
-  SocketState state = 6
-      [(validate.rules).message.required = true, (validate.rules).enum.defined_only = true];
+  SocketState state = 6 [(validate.rules).enum.defined_only = true];
 }
 
 // Runtime derived FractionalPercent with defaults for when the numerator or denominator is not