gh-130605: reenable test_concurrent_futures tests under TSAN (#135790)

Author: kumaraditya303

Lib/test/libregrtest/tsan.py

@@ -8,7 +8,7 @@
     'test_capi.test_pyatomic',
     'test_code',
     'test_ctypes',
-    # 'test_concurrent_futures',  # gh-130605: too many data races
+    'test_concurrent_futures',
     'test_enum',
     'test_functools',
     'test_httpservers',