Update sphobjinv to 2.3.1.2

[pyup-bot]

This PR updates sphobjinv from 2.3.1 to 2.3.1.2.

Changelog

2.3.1.1

Tests

* Update test machinery for the shell examples in the README, downstream of
 the conversion to Markdown ([289]).

Administrative

* Added formal support for Python 3.12.

* Removed formal support for Python 3.7, which is end-of-life.

* Bump `checkout` and `setup-python` GitHub Actions versions ([289]).

* Convert README from reST to Markdown ([289], fixes [287]).

* Fix some broken/redirecting docs links ([289]).

* Adjust `flake8` configuration to account for some new lint warnings/errors
 ([289]).

Links

• PyPI: https://pypi.org/project/sphobjinv
• Changelog: https://data.safetycli.com/changelogs/sphobjinv/