MAINT: Upgrade ruff to v0.6.4

[BenjaminBossan]

What does this PR do?

Currently used version, 0.2.1, is quite old at this point.

Not a lot needed to be changed:

• Change ruff version in setup.py
• Remove deprecated ignore-init-module-imports option for ruff
• Type comparison should use is not and not !=
• Use f-string instead of % formatting
• Some line wrapping and empty lines

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• Did you write any new necessary tests?

[HuggingFaceDocBuilderDev]

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[muellerzr]

Nice! 🚀 Very happy that it's not a crazy diff difference :)