chore: bump alkcall to 0.3.1; drop leftover bench dev-deps

- alkcall 0.1.1 -> 0.3.1 (crates.io latest). No API breakage in the
  surfaces alktty uses (core, channels, registry); all verification
  gates pass unchanged.
- remove criterion + alktype dev-deps and the [[bench]] section: the
  wire_vs_bast benchmark was extracted to the alktype project, leaving
  this config dead.

Cargo.toml

@@ -24,7 +24,7 @@ default = []
 local = ["dep:portable-pty", "dep:tokio-util", "tokio/process", "tokio/rt-multi-thread"]
 
 [dependencies]
-alkcall = "0.1.1"
+alkcall = "0.3.1"
 # Minimal, wasm-clean tokio features. `local` adds `process` +
 # `rt-multi-thread` (non-wasm). Do NOT use `features = ["full"]` — it
 # pulls in `signal`/`fs`/`net` which break `wasm32-unknown-unknown`.