Regenerate Cargo.lock with targeted insta update

The previous `cargo update --manifest-path zjit/Cargo.toml` re-resolved
all dependencies, and Rust 1.84+'s MSRV-aware resolver downgraded cc
(1.2.18 -> 1.0.94) and libc (0.2.171 -> 0.2.163) to satisfy yjit's
rust-version = "1.58.0". This caused test_recompile_no_profile_send to
fail on macOS ARM64 CI.

Fix by using `cargo update -p insta` to only update insta and its
transitive deps, preserving the existing cc and libc versions.

Author: k0kubun