Update dependencies

[MarekSuchanek]

• renamed requirements.direct.txt to requirements.in which is more common
• updated all fixed dependencies in requirements.txt to current set

[Copilot]

Pull request overview

Updates the project’s pinned Python documentation/build dependencies and standardizes the “direct dependencies” input file name.

Changes:

• Refreshed pinned versions in requirements.txt (including adding new transitive pins like accessible-pygments and roman-numerals)
• Replaced requirements.direct.txt with requirements.in to represent direct dependencies

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
requirements.txt	Updates the pinned dependency set used by CI/RTD installs.
requirements.in	Introduces the direct-dependency input list under a more conventional name.
requirements.direct.txt	Removes the previous direct-dependency list file (effectively renamed to requirements.in).

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