gh-36437: src/sage/parallel/map_reduce.py: replace tmp_dir()
    
Standard `tempfile.TemporaryDirectory()` replacement for `tmp_dir()` and
fix a deprecation warning while we're at it.

Issue: #36322
    
URL: #36437
Reported by: Michael Orlitzky
Reviewer(s): Marc Mezzarobba

Author: Release Manager

src/sage/parallel/map_reduce.py

@@ -293,8 +293,9 @@
 The profiling is activated by the ``profile`` parameter. The value provided
 should be a prefix (including a possible directory) for the profile dump::
 
-    sage: prof = tmp_dir('RESetMR_profile') + 'profcomp'
-    sage: res = S.run(profile=prof)  # random
+    sage: import tempfile
+    sage: d = tempfile.TemporaryDirectory(prefix="RESetMR_profile")
+    sage: res = S.run(profile=d.name)  # random
     [RESetMapReduceWorker-1:58] (20:00:41.444) Profiling in
     /home/user/.sage/temp/.../32414/RESetMR_profilewRCRAx/profcomp1
     ...
@@ -309,7 +310,7 @@
 :class:`cProfile.Profile` for more details::
 
     sage: import cProfile, pstats
-    sage: st = pstats.Stats(prof+'0')
+    sage: st = pstats.Stats(d.name+'0')
     sage: st.strip_dirs().sort_stats('cumulative').print_stats()  # random
     ...
        Ordered by: cumulative time
@@ -320,6 +321,11 @@
     ...
     <pstats.Stats instance at 0x7fedea40c6c8>
 
+Like a good neighbor we clean up our temporary directory as soon as
+possible::
+
+    sage: d.cleanup()
+
 .. SEEALSO::
 
     `The Python Profilers <https://docs.python.org/2/library/profile.html>`_
@@ -1713,7 +1719,7 @@ def run(self):
             PROFILER.runcall(self.run_myself)
 
             output = profile + str(self._iproc)
-            logger.warn(f"Profiling in {output} ...")
+            logger.warning(f"Profiling in {output} ...")
             PROFILER.dump_stats(output)
         else:
             self.run_myself()