Update to Pygments 2.13.0

[CookiePLMonster]

This fixes an incompatibility with Python 3.11 that upgraded this 6-year-old deprecation warning to an error: https://bugs.python.org/issue47066

It's an easy fix HERE, but at this rate it might be a better idea to update to the latest Pygments and get this fix "automatically".

I have verified the following still work, and syntax highlighting works as expected in those cases:

1. Creating a new diff via diaphora.py between two already generated databases.
2. Loading an existing diff file via diaphora-load.py.

I just dropped the entire Pygments 2.13.0 into the repo, I am not aware of any omitted files and/or custom changes in your current copy in the repository.

[lgtm-com[bot]]

This pull request introduces 167 alerts and fixes 12 when merging 925d6ab27da7c2e56064c4076daa9610e6e4bd6d into be78f2ce77711c607aa14c6c6c67408f44864bf1 - view on LGTM.com

new alerts:

• 73 for Membership test with a non-container
• 55 for First parameter of a method is not named 'self'
• 29 for Unused import
• 3 for Unreachable code
• 2 for Unnecessary 'else' clause in loop
• 2 for `__init__` method calls overridden method
• 1 for Unnecessary pass
• 1 for Non-iterable used in for loop
• 1 for Implicit string concatenation in a list

fixed alerts:

• 4 for Unused import
• 4 for Variable defined multiple times
• 2 for Redundant comparison
• 1 for First parameter of a method is not named 'self'

• 1 for Nested loops with same variable

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[joxeankoret]

Let me take a look to the whole because I haven't tested at all, yet, Python 3.11. I'm sick with covid right now so, give me a few days.

[joxeankoret]

Done with 9a852b5c04c318f1844821d4a17026204c395155. Thank you very much!