Cache class: Fix crash on data race on Windows. (#12579)

* Cache class: Fix crash on data race on Windows.

On Windows, the error gets mapped to a different
errno when a race happens, see
https://github.com/python/cpython/blob/cecd6012b0ed5dca3916ae341e705ae44172991d/PC/errmap.h#L107.
Therefore, we were observing crashes from that
code path, as the error wasn't being handled,
but bubbled up.

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AUTHORS

@@ -96,6 +96,7 @@ Christopher Gilling
 Claire Cecil
 Claudio Madotto
 Clément M.T. Robert
+Cornelius Riemenschneider
 CrazyMerlyn
 Cristian Vera
 Cyrus Maden

changelog/12580.bugfix.rst

@@ -0,0 +1 @@
+Fixed a crash when using the cache class on Windows and the cache directory was created concurrently.

src/_pytest/cacheprovider.py

@@ -232,7 +232,8 @@ def _ensure_cache_dir_and_supporting_files(self) -> None:
                 # gets "Directory not empty" from the rename. In this case,
                 # everything is handled so just continue (while letting the
                 # temporary directory be cleaned up).
-                if e.errno != errno.ENOTEMPTY:
+                # On Windows, the error is a FileExistsError which translates to EEXIST.
+                if e.errno not in (errno.ENOTEMPTY, errno.EEXIST):
                     raise
             else:
                 # Create a directory in place of the one we just moved so that