rust/checksum(deps): bump wit-bindgen in /tools/checksum_updater

Bumps [wit-bindgen](https://github.com/bytecodealliance/wit-bindgen) from 0.48.1 to 0.49.0.
- [Release notes](https://github.com/bytecodealliance/wit-bindgen/releases)
- [Commits](bytecodealliance/wit-bindgen@v0.48.1...v0.49.0)

---
updated-dependencies:
- dependency-name: wit-bindgen
  dependency-version: 0.49.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

tools/checksum_updater/Cargo.lock

@@ -31,7 +31,7 @@ tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 tempfile = "3.23"
 async-trait = "0.1"
-wit-bindgen = "0.48.1"  # WIT binding generation for macro usage (MUST match CLI version in wasm_toolchain.bzl)
+wit-bindgen = "0.49.0"  # WIT binding generation for macro usage (MUST match CLI version in wasm_toolchain.bzl)
 uuid = { version = "1.18", default-features = false }  # UUID generation for user service (deterministic, no getrandom dependency)
 bitflags = "2.6"  # Bitflags for WASI filesystem interfaces in generated bindings