proxy: v2.200.0 (#10822)

This proxy release fixes an issue where outbound proxies would attempt
protocol detection on ports that are marked as opaque. It also adds
support for ranges (such as `10-20`) in the
`LINKERD2_PROXY_INBOUND_PORTS_DISABLE_PROTOCOL_DETECTION` and
`LINKERD2_PROXY_INBOUND_PORTS` environment variables. Finally, it
changes the proxy to synthesize default client policies when the policy
controller returns an `Unimplemented` gRPC status code, allowing 2.13
proxies to coexist with 2.12 control planes in downgrade scenarios.

---

* outbound: determine protocol based on `OutboundPolicy` (linkerd/linkerd2-proxy#2397)
* set default `trust_dns` log level to `ERROR` (linkerd/linkerd2-proxy#2393)
* outbound: test load balancer behavior with failure accrual (linkerd/linkerd2-proxy#2375)
* outbound: add missing `meta` field in test policy (linkerd/linkerd2-proxy#2400)
* inbound: determine default policies using the opaque ports env var (linkerd/linkerd2-proxy#2395)
* outbound: synthesize client policies on `Unimplemented` (linkerd/linkerd2-proxy#2396)
* build(deps): bump io-lifetimes from 1.0.4 to 1.0.10 (linkerd/linkerd2-proxy#2379)
* chore: allow `syn` v1 and v2 to coexist peacefully (linkerd/linkerd2-proxy#2401)
* build(deps): bump futures from 0.3.26 to 0.3.28 (linkerd/linkerd2-proxy#2370)
* build(deps): bump async-trait from 0.1.66 to 0.1.68 (linkerd/linkerd2-proxy#2368)

Signed-off-by: Eliza Weisman <eliza@buoyant.io>