Bump sqlfluff from 1.4.5 to 2.1.3

Bumps [sqlfluff](https://github.com/sqlfluff/sqlfluff) from 1.4.5 to 2.1.3.
- [Release notes](https://github.com/sqlfluff/sqlfluff/releases)
- [Changelog](https://github.com/sqlfluff/sqlfluff/blob/main/CHANGELOG.md)
- [Commits](sqlfluff/sqlfluff@1.4.5...2.1.3)

---
updated-dependencies:
- dependency-name: sqlfluff
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>