fix mypy issues with global_counter test

Author: Vizonex

tests/isolated/multidict_global_counter.py

@@ -7,12 +7,12 @@
 if not FREETHREADED:
     raise SystemExit(0)
 
-md = MultiDict()
+md: MultiDict[int] = MultiDict()
 N, M = 3, 100
-baseline = multidict.getversion(md)
+baseline = multidict.getversion(md)  # type: ignore[arg-type]
 
 
-def worker(tid):
+def worker(tid: int) -> None:
     for i in range(M):
         md[f"k{tid}_{i}"] = i
 
@@ -24,7 +24,7 @@ def worker(tid):
     for t in threads:
         t.join()
 
-    observed = multidict.getversion(md) - baseline
+    observed = multidict.getversion(md) - baseline  # type: ignore[arg-type]
     expected = N * M
     assert expected == observed, (
         f"expected delta: {expected}"