chore(deps-dev): update ast-serialize requirement from <0.5 to <0.6 (#150)

Updates the requirements on [ast-serialize](https://github.com/mypyc/ast_serialize) to permit the latest version.
- [Commits](mypyc/ast_serialize@v0.1.0...v0.5.0)

---
updated-dependencies:
- dependency-name: ast-serialize
  dependency-version: 0.5.0
  dependency-type: direct:development
...

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Author: dependabot[bot]

pyproject.toml

@@ -84,7 +84,7 @@ dev = [
     # Transitive of mypy 2.1.x. Pin <0.5 because 0.5.0 only ships cp314
     # wheels (cp39-abi3 dropped), breaking CI on Python 3.12 + 3.13 runners.
     # Drop once upstream republishes broader wheels.
-    "ast-serialize<0.5",
+    "ast-serialize<0.6",
     "datamodel-code-generator>=0.26",
     "pyyaml>=6",
     "python-dotenv>=1",