Update validate-pyproject requirement in /cratedb_sqlparse_py

Updates the requirements on [validate-pyproject](https://github.com/abravalheri/validate-pyproject) to permit the latest version.
- [Release notes](https://github.com/abravalheri/validate-pyproject/releases)
- [Changelog](https://github.com/abravalheri/validate-pyproject/blob/main/CHANGELOG.rst)
- [Commits](abravalheri/validate-pyproject@v0.0.1...v0.19)

---
updated-dependencies:
- dependency-name: validate-pyproject
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

cratedb_sqlparse_py/pyproject.toml

@@ -84,7 +84,7 @@ develop = [
   "poethepoet<0.28",
   "pyproject-fmt<2.3",
   "ruff<0.6",
-  "validate-pyproject<0.19",
+  "validate-pyproject<0.20",
 ]
 generate = [
   "antlr4-tools<0.3",