Support sqlglot 28 and 29

[rolandwalker]

Description

Fixes #1696

Confirmed locally that the test suite runs with sqlglot 28 and 29.

Checklist

• I added this contribution to the changelog.md file.
• I added my name to the AUTHORS file (or it's already there).
• To lint and format the code, I ran

  uv run ruff check && uv run ruff format && uv run mypy --install-types .

[github-actions]

1. Missing validation for the newly supported versions (pyproject.toml:17)
   • The PR widens sqlglot to >=27,<30 and claims support for 28/29, but no tests or CI matrix updates were added to exercise sqlglot==28.* and sqlglot==29.*.
   • Risk: compatibility regressions can ship unnoticed (especially around token/parsing APIs used in parseutils/hybrid_redirection).
   • Action: add at least two test jobs (or tox envs) that pin sqlglot==28.* and sqlglot==29.* and run the existing test suite (or a targeted parser/tokenization subset if runtime is a concern).

No direct security issues are introduced by this diff.