Update dependency cachetools to v6

Author: renovate[bot]

pyproject.toml

@@ -34,7 +34,7 @@ dependencies = [
     "pydantic (>=2.11.3,<2.12.0)",
     "requests (>=2.32.3,<2.33.0)",
     "setuptools (>=80.9.0,<80.10.0)",
-    "cachetools (>=5.5.0,<5.6.0)",
+    "cachetools (>=6.1.0,<6.2.0)",
     "prometheus-client (>=0.22.1,<0.23.0)",
     "opentelemetry-api (>=1.35.0,<1.36.0)",
     "opentelemetry-sdk (>=1.35.0,<1.36.0)",