owners: ggreenway to emeritus (#5947)
owners: ggreenway to emeritus (#5947)

Sadly, I am moving on to different things. The Envoy maintainers and community
have been great to work with. I wish you the best going forward.

Signed-off-by: Greg Greenway <f58b4fce410ab27c1d5cc4afd1f2a190e9aa65c3@apple.com>
envoyproxy/envoy,istio/envoy,lyft/envoy,lyft/envoy,dnoe/envoy,envoyproxy/envoy,jrajahalme/envoy,jrajahalme/envoy,istio/envoy,envoyproxy/envoy,lizan/envoy,lyft/envoy,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,istio/envoy,envoyproxy/envoy,istio/envoy,dnoe/envoy,eklitzke/envoy,istio/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,lizan/envoy,envoyproxy/envoy-wasm,lizan/envoy,eklitzke/envoy,dnoe/envoy,jrajahalme/envoy,istio/envoy,dnoe/envoy,envoyproxy/envoy,lizan/envoy,eklitzke/envoy,envoyproxy/envoy,jrajahalme/envoy,dnoe/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy