message: third-party/rust: update futures
  Summary:
  Those newer versions of Futures have compatibility improvements with Tokio,
  notably:
diff: @@ -17,7 +17,7 @@ async-trait = "0.1.29"
  codegen_includer_proc_macro = { path = "../../common/rust/shed/codegen_includer_proc_macro" }
  const-cstr = "0.3.0"
  fbthrift = { path = "../../thrift/lib/rust" }
  -futures = { version = "0.3.5", features = ["async-await", "compat"] }
  +futures = { version = "0.3.13", features = ["async-await", "compat"] }
  lazy_static = "1.0"
  ref-cast = "1.0.2"
  serde = { version = "=1.0.118", features = ["derive", "rc"] }
  