proxy: v2.82.0 (#3848)

This release adds a defense mechanism to ensure that resolutions are
released when the associated balancer becomes idle and should have
been dropped from the proxy.

Furthermore, the proxy is now more selective as to which gRPC status
codes are considered "failures" in metrics.

---

* Classify some gRPC status codes as non-errors (linkerd/linkerd2-proxy#395)
* discover: Timeout stalled resolutions (linkerd/linkerd2-proxy#401)

.proxy-version

@@ -1 +1 @@
-v2.81.0
+v2.82.0