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.lock

@@ -27,9 +27,9 @@ dependencies = [
 
 [[package]]
 name = "alkcall"
-version = "0.1.1"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49664a13ea571d7a6e59c9ed52d165dfdfe389c9a93bb301cc1fb86f29bae8bd"
+checksum = "d4116dba284601e3337e918d4a4256706e43dd8bb6a30095bf96d664ae58d74a"
 dependencies = [
  "async-trait",
  "bytes",