Docs failing to build on latest/8.3.x

We are getting this failure when building the docs for main and 8.3.x:

Traceback
=========

    Traceback (most recent call last):
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/cmd/build.py", line 432, in build_main
        app.build(args.force_all, args.filenames)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/application.py", line 426, in build
        self.builder.build_update()
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 372, in build_update
        self.build(['__all__'], summary=to_build, method='update')
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 454, in build
        self.write(docnames, updated_docnames, method)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 735, in write
        self.write_documents(docnames)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/builders/latex/__init__.py", line 333, in write_documents
        doctree = self.assemble_doctree(
                  ^^^^^^^^^^^^^^^^^^^^^^
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/builders/latex/__init__.py", line 406, in assemble_doctree
        self.env.resolve_references(largetree, indexfile, self)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/environment/__init__.py", line 759, in resolve_references
        self.apply_post_transforms(doctree, fromdocname)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/environment/__init__.py", line 773, in apply_post_transforms
        transformer.apply_transforms()
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/transforms/__init__.py", line 92, in apply_transforms
        super().apply_transforms()  # type: ignore[misc]
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/docutils/transforms/__init__.py", line 182, in apply_transforms
        transform.apply(**kwargs)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/transforms/post_transforms/images.py", line 38, in apply
        self.handle(node)
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinx/transforms/post_transforms/images.py", line 273, in handle
        if self.convert(abs_srcpath, destpath):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/docs/checkouts/readthedocs.org/user_builds/pytest/envs/8.3.x/lib/python3.12/site-packages/sphinxcontrib/inkscapeconverter.py", line 71, in convert
        args += ['--export-filename=' + _to, _from]
                 ~~~~~~~~~~~~~~~~~~~~~^~~~~
    TypeError: can only concatenate str (not "_StrPath") to str

(Raw logs: https://app.readthedocs.org/api/v2/build/27363375.txt)

https://app.readthedocs.org/projects/pytest/builds/27361294/
https://app.readthedocs.org/projects/pytest/builds/27363375/

Looking at the inkscapeconverter.py code, the traceback points to the latest version:

https://github.com/missinglinkelectronics/sphinxcontrib-svg2pdfconverter/blob/7ece3cbe92289f7014d6f25fc7fa7ea2d9de45b6/sphinxcontrib/inkscapeconverter.py#L71

This is unfortunately preventing the changelog from being built, and announcing 8.3.5.

Posting here in case anybody has a suggestion, otherwise I will post it back in the Sphinx tracker for advice.

Start with the Read the Docs raw logs and the referenced sphinxcontrib/inkscapeconverter.py line 71, where the traceback occurs during the LaTeX documentation build. Reproduce the failure for main or 8.3.x, then verify that the changelog and documentation build successfully without the TypeError.