Fixed a case when template variable is WindowsPath

[NtWriteCode]

Thanks for contributing, make sure you address all the checklists (for details on how see development documentation)

I think the fix is trivial enough not to create new tests on them.
Also I'm unsure if it's going to be a new release, hence I didn't change the changelog.

[maresb]

I'm hitting this the corresponding issue also on Linux when running pre-commit:

[INFO] Installing environment for https://github.com/astral-sh/ruff-pre-commit. [INFO] Once installed this environment will be reused. [INFO] This may take a few minutes... An unexpected error has occurred: CalledProcessError: command: ('/opt/conda/bin/python3.11', '-mvirtualenv', '/home/mambauser/.cache/pre-commit/repopp_kosvk/py_env-python3') return code: 1 stdout: AttributeError: 'PosixPath' object has no attribute 'endswith' stderr: (none)

$ python -mvirtualenv --with-traceback /tmp/x Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main File "<frozen runpy>", line 88, in _run_code File "/opt/conda/lib/python3.11/site-packages/virtualenv/__main__.py", line 70, in <module> run_with_catch() # pragma: no cov ^^^^^^^^^^^^^^^^ File "/opt/conda/lib/python3.11/site-packages/virtualenv/__main__.py", line 56, in run_with_catch run(args, options, env) File "/opt/conda/lib/python3.11/site-packages/virtualenv/__main__.py", line 18, in run session = cli_run(args, options, env) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/lib/python3.11/site-packages/virtualenv/run/__init__.py", line 33, in cli_run of_session.run() File "/opt/conda/lib/python3.11/site-packages/virtualenv/run/session.py", line 46, in run self._activate() File "/opt/conda/lib/python3.11/site-packages/virtualenv/run/session.py", line 65, in _activate activator.generate(self.creator) File "/opt/conda/lib/python3.11/site-packages/virtualenv/activation/via_template.py", line 27, in generate generated = self._generate(replacements, self.templates(), dest_folder, creator) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/conda/lib/python3.11/site-packages/virtualenv/activation/via_template.py", line 51, in _generate encoding = "utf-8-sig" if template.endswith(".ps1") else "utf-8" ^^^^^^^^^^^^^^^^^ AttributeError: 'PosixPath' object has no attribute 'endswith' 

Glad to see this merged, it'd be great to get this released soon.