proxy: v2.161.4

large number of service discovery updates, for incorrect handling of
`CONNECT` requests with `Content-Length` headers, and for a failure to
correctly resolve DNS SRV records for the control plane.

---

1817b3f3 update Tower to 0.4.13 to fix load balancer panic (linkerd/linkerd2-proxy#1758)
bc512765 dns: Fall back to A record when SRV resolution fails (linkerd/linkerd2-proxy#1670)
ac1039b0 http: Strip illegal headers from CONNECT responses (linkerd/linkerd2-proxy#1699)
ebcf7cbd Dedupe discovery updates (linkerd/linkerd2-proxy#1759)

.proxy-version

@@ -1 +1 @@
-v2.161.3
+v2.161.4