Backport of Update Envoy compatibility matrices to include consul 1.20.x and dataplane 1.6.x into release/1.20.x#21853

nathancoleman merged 4 commits intorelease/1.20.xhashicorp/consul:release/1.20.xfrom

backport/update-envoy-docs/sadly-positive-labradorhashicorp/consul:backport/update-envoy-docs/sadly-positive-labradorCopy head branch name to clipboard