Update TeX.gitignore to capture .pygtex and .pygstyle

[daniel-jakob]

Reasons for making this change:

When minted is ran with caching enabled, two file types are created used in the caching process, .pgytex and .pygstyle. These were not being captured before pull request.

Links to documentation supporting these rule changes:

https://tug.ctan.org/macros/latex/contrib/minted/minted.pdf .pygtex files are discussed in the section 8.3 of the implementation portion of the documentation and .pygstyle is mentioned in section 8.5.

[vvhybe]

I think this is what they called the magic of open source :octocat:, it's putting effort into your contribution 💯wich will make it more spicy

[daniel-jakob]

Just wondering if there is any work being done on this repo? Don't see too many pull requests being merged.