upstream: bump Envoy ref

Bumping to include:
- `dns: destroy/reinitialize c-ares channel on ARES_ECONNREFUSED`: envoyproxy/envoy#9899. This should resolve the issues we've been seeing with Envoy Mobile hanging on startup and never properly issuing requests if started in the offline state on iOS
- `gzip: add force load factory declaration`: envoyproxy/envoy#9942. This will allow us to use the gzip filter with Envoy Mobile

Signed-off-by: Michael Rebello <[email protected]>