Update requirements.txt

env variables PR is failing So cachetools version updated

Author: siddhartha-quad

community/front-end/ofe/requirements.txt

@@ -6,7 +6,7 @@ astroid==3.3.11
 attrs==25.3.0
 # This should be supported by zoneinfo in Python 3.9+
 backports.zoneinfo==0.2.1;python_version<"3.9"
-cachetools==6.2.0
+cachetools>=2.0,<6.0
 certifi==2025.8.3
 cffi==1.17.1
 cfgv==3.4.0