Poetry fails to install project with FileExistsError when several instances of poetry are started simultaneously

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Windows 10 21H1 (Hyper-V default dev environment at a moment)
• Poetry version: 1.2.0a2 (c967a4a5); 1.1.7
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/Phobosmir/85135e82b1b9a7c455c8b646c43e0954

Issue

Steps:

1. Prepare pyproject.toml with some "heavy" packages in dependencies, e.g. https://gist.github.com/Phobosmir/85135e82b1b9a7c455c8b646c43e0954
2. Copy it to different directories
3. Run several instances of poetry install simultaneously

Expected:
All projects are successfully installed

Actual:
Some of installations fails with FileExistsError.
Reproduction rate is very high.

<...>
Stack trace:

  6  ~\AppData\Roaming\pypoetry\venv\lib\site-packages\urllib3\response.py:438 in _error_catcher
      436│         try:
      437│             try:
    → 438│                 yield
      439│
      440│             except SocketTimeout:

  5  ~\AppData\Roaming\pypoetry\venv\lib\site-packages\urllib3\response.py:519 in read
      517│             else:
      518│                 cache_content = False
    → 519│                 data = self._fp.read(amt) if not fp_closed else b""
      520│                 if (
      521│                     amt != 0 and not data

  4  ~\AppData\Roaming\pypoetry\venv\lib\site-packages\cachecontrol\filewrapper.py:65 in read
       63│         self.__buf.write(data)
       64│         if self.__is_fp_closed():
    →  65│             self._close()
       66│
       67│         return data

  3  ~\AppData\Roaming\pypoetry\venv\lib\site-packages\cachecontrol\filewrapper.py:52 in _close
       50│     def _close(self):
       51│         if self.__callback:
    →  52│             self.__callback(self.__buf.getvalue())
       53│
       54│         # We assign this to None here, because otherwise we can get into

  2  ~\AppData\Roaming\pypoetry\venv\lib\site-packages\cachecontrol\controller.py:308 in cache_response
      306│         if self.cache_etags and "etag" in response_headers:
      307│             logger.debug("Caching due to etag")
    → 308│             self.cache.set(
      309│                 cache_url, self.serializer.dumps(request, response, body=body)
      310│             )

  1  ~\AppData\Roaming\pypoetry\venv\lib\site-packages\cachecontrol\caches\file_cache.py:128 in set
      126│         with self.lock_class(name) as lock:
      127│             # Write our actual file
    → 128│             with _secure_open_write(lock.path, self.filemode) as fh:
      129│                 fh.write(value)
      130│

  FileExistsError

  [Errno 17] File exists: 'C:\\Users\\User\\AppData\\Local\\pypoetry\\Cache\\cache\\repositories\\pypi\\_http\\d\\a\\b\\8\\5\\dab85a2ce42d218d1f319dd5cfbe3d50b166447530e60aee10277972'

<...>

Ready batch scripts for reproduction could be found in repo:
https://github.com/Phobosmir/poetry-install-failure

When installing with pip + requirements.txt no issues could be found.

Tested on clean win10, no antiviruses or other staff. only git + python were installed.

Reproduce the failure with the batch scripts in the linked poetry-install-failure repository while running several installs against the same cache. Start at the cache write path shown in cachecontrol\caches\file_cache.py and investigate the FileExistsError on Windows. Done means simultaneous Poetry installs complete successfully without cache-related failures.