rust/toolchains(deps): bump wit-parser in /tools-builder/toolchains (#477)

Bumps [wit-parser](https://github.com/bytecodealliance/wasm-tools) from 0.246.2 to 0.250.0.
- [Release notes](https://github.com/bytecodealliance/wasm-tools/releases)
- [Commits](https://github.com/bytecodealliance/wasm-tools/commits)

---
updated-dependencies:
- dependency-name: wit-parser
  dependency-version: 0.250.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tools-builder/toolchains/Cargo.lock

@@ -21,5 +21,5 @@ wasm-encoder = "0.246"
 wat = "1.246"
 
 # Component model support
-wit-parser = "0.246"
+wit-parser = "0.250"
 wit-component = "0.250"