Update dependency ruff to v0.15.20

Author: renovate[bot]

pyproject.toml

@@ -37,7 +37,7 @@ dev = [
     "mypy==2.1.0",
     "flake8==7.3.0",
     "pre-commit==4.6.0",
-    "ruff==0.15.17",
+    "ruff==0.15.20",
     "pylint==4.0.6",
     "pytest==9.0.3",
     "hypothesis>=6.152.4",