build(deps): update ruff requirement from <0.6.3 to <0.6.4 (#327)

pyproject.toml

@@ -28,7 +28,7 @@ requires-python = ">=3.11"
 lint = [
     # NOTE: ruff is under active development, so we pin conservatively here
     # and let Dependabot periodically perform this update.
-    "ruff < 0.6.3",
+    "ruff < 0.6.4",
     "mypy >= 1.0",
     "types-pyyaml",
     "types-pyOpenSSL",