update flutter math - Githubissues

Description

Updates flutter_math_fork to the latest version.

[x] I have made myself familiar with the CaTeX contributing guide.
[x] I added a PR description.
[x] I linked all related issues and PRs I could find (no links if there are none).
[x] If this PR changes anything about the main math_keyboard or example package (also README etc.), I created an entry in CHANGELOG.md (## UPCOMING RELEASE if the change on its own is not worth an update).
[x] If this PR includes a notable change in the math_keyboard package, I updated the version according to Dart's semantic versioning.
[x] If there is new functionality in code, I added tests covering all my additions.
[x] All required checks pass.