`requires-plugins` breaks poetry installation on Windows

### Description



I have a poetry project, which I install and test on Windows machine in GitHub Actions.

Recently, I tried using the new `requires-plugins` feature for `poethepoet` and `poetry-plugin-export` plugins installation.

The `pyproject.toml` file looks somewhat like this:

```toml

...

[tool.poetry.requires-plugins]

poethepoet = "^0.32.1"

poetry-plugin-export = "^1.9.0"

...

```



However, instead of expected installation, what I receive is an error:

```txt

Ensuring that the Poetry plugins required by the project are available...

The following Poetry plugins are required by the project but are not installed in Poetry's environment:

  - poethepoet (>=0.32.1,<0.33.0)

  - poetry-plugin-export (>=1.9.0,<2.0.0)

Installing Poetry plugins only for the current project...

Updating dependencies

Resolving dependencies...



Package operations: 4 installs, 0 updates, 0 removals



  - Installing pastel (0.2.1)

  - Installing pyyaml (6.0.2)

  - Installing poethepoet (0.32.1)

  - Installing poetry-plugin-export (1.9.0)



  ValueError



  path is on mount 'C:', start on mount 'D:'



  at C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\ntpath.py:747 in relpath

      743|         path_abs = abspath(normpath(path))

      744|         start_drive, start_rest = splitdrive(start_abs)

      745|         path_drive, path_rest = splitdrive(path_abs)

      746|         if normcase(start_drive) != normcase(path_drive):

    > 747|             raise ValueError("path is on mount %r, start on mount %r" % (

      748|                 path_drive, start_drive))

      749| 

      750|         start_list = [x for x in start_rest.split(sep) if x]

      751|         path_list = [x for x in path_rest.split(sep) if x]



Cannot install poethepoet.





Failed to install required Poetry plugins

```



### Workarounds



The plugins still can be installed traditionally, using `poetry self add ...`.

However, I still would like to try the new feature... it works on Linux so nice!



### Poetry Installation Method



pip



### Operating System



`windiws-latest` (that is `Windows Server 2022 OS Version: 10.0.20348 Build 2966`)



### Poetry Version



Poetry (version 2.0.1)



### Poetry Configuration



```bash session

cache-dir = "C:\\Users\\runneradmin\\AppData\\Local\\pypoetry\\Cache"

installer.max-workers = null

installer.no-binary = null

installer.only-binary = null

installer.parallel = true

installer.re-resolve = true

keyring.enabled = true

requests.max-retries = 0

solver.lazy-wheel = true

system-git-client = false

virtualenvs.create = true

virtualenvs.in-project = null

virtualenvs.options.always-copy = false

virtualenvs.options.no-pip = false

virtualenvs.options.system-site-packages = false

virtualenvs.path = "{cache-dir}\\virtualenvs"  # C:\Users\runneradmin\AppData\Local\pypoetry\Cache\virtualenvs

virtualenvs.prompt = "{project_name}-py{python_version}"

virtualenvs.use-poetry-python = false

```





### Python Sysconfig



<details>

  <summary>sysconfig.log</summary>

  <!-- Please leave one blank line below for enabling the code block rendering. -->



Platform: "win-amd64"

Python version: "3.10"

Current installation scheme: "nt"

Paths: 

	data = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	include = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Include"

	platinclude = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Include"

	platlib = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Lib\site-packages"

	platstdlib = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Lib"

	purelib = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Lib\site-packages"

	scripts = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Scripts"

	stdlib = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Lib"

Variables: 

	BINDIR = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	BINLIBDEST = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Lib"

	EXE = ".exe"

	EXT_SUFFIX = ".cp310-win_amd64.pyd"

	INCLUDEPY = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Include"

	LIBDEST = "C:\hostedtoolcache\windows\Python\3.10.11\x64\Lib"

	SO = ".cp310-win_amd64.pyd"

	TZPATH = ""

	VERSION = "310"

	abiflags = ""

	base = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	exec_prefix = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	installed_base = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	installed_platbase = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	platbase = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	platlibdir = "lib"

	prefix = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	projectbase = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	py_version = "3.10.11"

	py_version_nodot = "310"

	py_version_nodot_plat = "310"

	py_version_short = "3.10"

	srcdir = "C:\hostedtoolcache\windows\Python\3.10.11\x64"

	userbase = "C:\Users\runneradmin\AppData\Roaming\Python"

  ```

  Paste the output of 'python -m sysconfig', over this line.

  ```

</details>





### Example pyproject.toml



```TOML

[tool.poetry.requires-plugins]

poethepoet = "^0.32.1"

poetry-plugin-export = "^1.9.0"

```





### Poetry Runtime Logs



<details>

  <summary>poetry-runtime.log</summary>

  <!-- Please leave one blank line below for enabling the code block rendering. -->



[output.txt](https://github.com/user-attachments/files/18394032/output.txt)

  ```

  Paste the output of 'poetry -vvv <command>', over this line.

  ```

</details>

[]