chore(deps): address hyper deprecations in policy-controller-grpc

Signed-off-by: katelyn martin <me+cratelyn@katelyn.world>

Author: cratelyn

policy-controller/grpc/Cargo.toml

@@ -11,7 +11,7 @@ async-trait = "0.1"
 http = "0.2"
 drain = "0.1"
 futures = { version = "0.3", default-features = false }
-hyper = { version = "0.14", features = ["http2", "server", "tcp"] }
+hyper = { version = "0.14", features = ["backports", "deprecated", "http2", "server", "tcp"] }
 linkerd-policy-controller-core = { path = "../core" }
 maplit = "1"
 prost-types = "0.12.6"