rust/toolchains(deps): bump wat in /tools-builder/toolchains (#518)

Bumps [wat](https://github.com/bytecodealliance/wasm-tools) from 1.251.0 to 1.252.0.
- [Release notes](https://github.com/bytecodealliance/wasm-tools/releases)
- [Commits](bytecodealliance/wasm-tools@v1.251.0...v1.252.0)

---
updated-dependencies:
- dependency-name: wat
  dependency-version: 1.252.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]