chore: lockfile alkcall 0.7.0 -> 0.7.1

The 0.7.1 lockfile resolution behind the MSRV floor raise. The
alkcall requirement in Cargo.toml stays "0.7.1" only after the floor
commit paired it there; the lockfile is the piece that actually moves
the resolved 0.7.x to the version whose MSRV (1.88) this crate now
declares. alkcall 0.7.1 changed no type alktunnels touches
(version-requirement- and patch-level only; full suite green on both
toolchains in the previous commit).

Cargo.lock

@@ -27,9 +27,9 @@ dependencies = [
 
 [[package]]
 name = "alkcall"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5162a10144df65b03b887e30f77eb30d956ca1ca460a3f81b409128cbcae3199"
+checksum = "ac26db919a1db9d72910ead8741af683bedefc625631028194b5f5e1dbd63cb6"
 dependencies = [
  "async-trait",
  "bytes",