Fixed incorrect typing

ddtrace/internal/utils/cache.py

@@ -9,9 +9,8 @@
 miss = object()
 
 T = TypeVar("T")
-S = TypeVar("S")
-F = Callable[[T], S]
-M = Callable[[Any, T], S]
+F = Callable[[T], Any]
+M = Callable[[Any, T], Any]
 
 
 class LFUCache(dict):
@@ -29,7 +28,7 @@ def __init__(self, maxsize=256):
         self.lock = RLock()
 
     def get(self, key, f):  # type: ignore[override]
-        # type: (T, Callable[[T], S]) -> S
+        # type: (T, Callable[[T], Any]) -> Any
         """Get a value from the cache.
 
         If the value with the given key is not in the cache, the expensive
@@ -69,7 +68,7 @@ def cached_wrapper(f):
         cache = LFUCache(maxsize)
 
         def cached_f(key):
-            # type: (Callable[[T], S]) -> S
+            # type: (T) -> Any
             return cache.get(key, f)
 
         cached_f.invalidate = cache.clear  # type: ignore[attr-defined]