rust/toolchains(deps): bump wat in /tools-builder/toolchains (#479)

Bumps [wat](https://github.com/bytecodealliance/wasm-tools) from 1.246.2 to 1.250.0.
- [Release notes](https://github.com/bytecodealliance/wasm-tools/releases)
- [Commits](bytecodealliance/wasm-tools@v1.246.2...v1.250.0)

---
updated-dependencies:
- dependency-name: wat
  dependency-version: 1.250.0
  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

@@ -18,7 +18,7 @@ log = "0.4"
 # WebAssembly parsing and manipulation
 wasmparser = "0.243"
 wasm-encoder = "0.246"
-wat = "1.246"
+wat = "1.250"
 
 # Component model support
 wit-parser = "0.250"