misc: remove outdated TODO (#9628)
misc: remove outdated TODO (#9628)

Cookie hash policies are supported (line 123) and the TODO references a closed issue (#1295). cc @htuch

Risk Level: low
Testing: n/a

Signed-off-by: Derek Argueta <7ca26d8611d7a7954bc67eac5286d36c49081bac@pinterest.com>
jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy,envoyproxy/envoy,istio/envoy,eklitzke/envoy,jrajahalme/envoy,istio/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,istio/envoy,lyft/envoy,envoyproxy/envoy,eklitzke/envoy,lyft/envoy,eklitzke/envoy,jrajahalme/envoy,envoyproxy/envoy,lizan/envoy,eklitzke/envoy,lizan/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,envoyproxy/envoy-wasm,istio/envoy,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,jrajahalme/envoy,lyft/envoy,jrajahalme/envoy,lizan/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,lizan/envoy,lizan/envoy