Bump sqlfluff from 2.1.1 to 2.2.1

Bumps [sqlfluff](https://github.com/sqlfluff/sqlfluff) from 2.1.1 to 2.2.1.
- [Release notes](https://github.com/sqlfluff/sqlfluff/releases)
- [Changelog](https://github.com/sqlfluff/sqlfluff/blob/main/CHANGELOG.md)
- [Commits](sqlfluff/sqlfluff@2.1.1...2.2.1)

---
updated-dependencies:
- dependency-name: sqlfluff
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,3 +1,3 @@
 dbt-snowflake==1.5.1
-sqlfluff==2.1.1
+sqlfluff==2.2.1
 yamllint==1.32.0