gh-159293: Restore the recursion limit after the free-threading race test (#159311)

Adds a cleanup to ensure interpreter state is restored after testing recursion
limit changes.

Author: zolaski333

Lib/test/test_free_threading/test_races.py

@@ -272,6 +272,8 @@ def mutate():
         do_race(set_value, mutate)
 
     def test_racing_recursion_limit(self):
+        self.addCleanup(sys.setrecursionlimit, sys.getrecursionlimit())
+
         def something_recursive():
             def count(n):
                 if n > 0:

Misc/NEWS.d/next/Tests/2026-10-13-13-34-00.gh-issue-159293.Lr8q2N.rst

@@ -0,0 +1,2 @@
+Restore the recursion limit after the free-threading recursion-limit race test
+to avoid failures in subsequent tests run in the same process.