rust/toolchains(deps): bump wit-component in /tools-builder/toolchains (#486)

Bumps [wit-component](https://github.com/bytecodealliance/wasm-tools) from 0.250.0 to 0.251.0.
- [Release notes](https://github.com/bytecodealliance/wasm-tools/releases)
- [Commits](https://github.com/bytecodealliance/wasm-tools/commits)

---
updated-dependencies:
- dependency-name: wit-component
  dependency-version: 0.251.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tools-builder/toolchains/Cargo.lock

@@ -22,4 +22,4 @@ wat = "1.250"
 
 # Component model support
 wit-parser = "0.251"
-wit-component = "0.250"
+wit-component = "0.251"