chore(deps): Update ruff requirement from ==0.14.* to ==0.15.* (#363)

Updates the requirements on [ruff](https://github.com/astral-sh/ruff) to permit the latest version.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.14.0...0.15.0)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

requirements-testing.txt

@@ -5,7 +5,7 @@ pytest-xdist == 3.*
 twine == 5.*
 mypy == 1.*
 black == 25.*
-ruff == 0.14.*
+ruff == 0.15.*
 moto[s3,sts] == 5.*
 pipgrip == 0.11.*
 types-pyyaml == 6.*