Fix Generators typeshed test (#10255)

typshed mistakenly set itertools.count as a function while it is actually a class. Meaning that it returns a class instance and then this clashes with the filter result.

Author: hatal175

test-data/samples/generators.py

@@ -6,7 +6,7 @@
 
 def iter_primes() -> Iterator[int]:
     # an iterator of all numbers between 2 and +infinity
-    numbers = itertools.count(2)
+    numbers: Iterator[int] = itertools.count(2)
 
     # generate primes forever
     while True: