chore(deps): update dependency backports.functools_lru_cache to v2

Author: renovate[bot]

setup.py

@@ -9,7 +9,7 @@
 _install_requires = [
     'deepmerge==1.1.1',
     'lru_cache==0.2.3',
-    'backports.functools_lru_cache==1.6.6',
+    'backports.functools_lru_cache==2.0.0',
     'pyyaml~=6.0.2',
     'boto3~=1.35.94',
     'hvac~=2.3.0'