🔧 test fixes for sphinx 7.4

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.14%. Comparing base (d448abf) to head (c73ec14). Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
myst_parser/sphinx_ext/mathjax.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #945 +/- ## ======================================= Coverage 90.13% 90.14% ======================================= Files 24 24 Lines 3416 3418 +2 ======================================= + Hits 3079 3081 +2 Misses 337 337 ``` | [Flag](https://app.codecov.io/gh/executablebooks/MyST-Parser/pull/945/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks) | Coverage Δ | | |---|---|---| | [pytests](https://app.codecov.io/gh/executablebooks/MyST-Parser/pull/945/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks) | `90.14% <80.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks#carryforward-flags-in-the-pull-request-comment) to find out more.

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