build(deps-dev): update ruff requirement from <0.15.5 to <0.15.6 (#1709)

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@v0.0.18...0.15.5)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.5
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -63,7 +63,7 @@ lint = [
   "mypy ~= 1.1",
   # NOTE(ww): ruff is under active development, so we pin conservatively here
   # and let Dependabot periodically perform this update.
-  "ruff < 0.15.5",
+  "ruff < 0.15.6",
   "types-requests",
   "types-pyOpenSSL",
 ]