gh-104090: Fix unittest collectedDurations resources leak

Lib/unittest/result.py

@@ -166,7 +166,8 @@ def addDuration(self, test, elapsed):
         """
         # support for a TextTestRunner using an old TestResult class
         if hasattr(self, "collectedDurations"):
-            self.collectedDurations.append((test, elapsed))
+            # Pass test repr and not the test object itself to avoid resources leak
+            self.collectedDurations.append((str(test), elapsed))
 
     def wasSuccessful(self):
         """Tells whether or not this result was a success."""

Misc/NEWS.d/next/Tests/2023-07-16-02-57-08.gh-issue-104090.cKtK7g.rst

@@ -0,0 +1 @@
+Fix unittest collectedDurations resources leak