Log Message:
py-sphinxcontrib-serializinghtml: update to 1.1.9.

Release 1.1.9 (2023-08-20)
==========================

* Serialise context["script_files"] and context["css_files"] \ 
as their filenames
  on Sphinx 7.2.0.

Release 1.1.8 (2023-08-14)
==========================

* Use ``os.PathLike`` over ``pathlib.Path``

Release 1.1.7 (2023-08-09)
==========================

* Fix tests for Sphinx 7.1 and below

Release 1.1.6 (2023-08-07)
==========================

* Drop support for Python 3.5, 3.6, 3.7, and 3.8
* Raise minimum required Sphinx version to 5.0