WIP Update Python packages

[joonas-somero]

Updates for packages in requirements.txt

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This was originally about some Dependabot alerts (the last one, about Pygments, doesn't have a fix yet, BTW).

It turns out that a warning is now logged when running mkdocs build. Setting the environment variable they mention only removes the WARNING type from logger while the message above the hyphens is still logged. The mentioned drop-in replacement for MkDocs, ProperDocs, was included as a dependency for Material for MkDocs, so at the time of writing there are two redundant "MkDocses" ("MkDocii?") in requirements.txt.

 │  ⚠  Warning from the Material for MkDocs team
 │
 │  MkDocs 2.0, the underlying framework of Material for MkDocs,
 │  will introduce backward-incompatible changes, including:
 │
 │  × All plugins will stop working – the plugin system has been removed
 │  × All theme overrides will break – the theming system has been rewritten
 │  × No migration path exists – existing projects cannot be upgraded
 │  × Closed contribution model – community members can't report bugs
 │  × Currently unlicensed – unsuitable for production use
 │
 │  Our full analysis:
 │
 │  https://squidfunk.github.io/mkdocs-material/blog/2026/02/18/mkdocs-2.0/

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WARNING: MkDocs may break support for all existing plugins and themes soon!

The owner of MkDocs has completely abandoned maintenance of the project, and instead is planning to publish a "version 2" which will not support any existing themes, plugins or even your configuration files. This v2 may eventually replace what you download with `pip install mkdocs`, suddenly breaking the build of your existing site.

To avoid these risks, switch to ProperDocs, a continuation of MkDocs 1.x and a drop-in replacement that supports your current MkDocs setup.
Simply install it with `pip install properdocs` and build your site with `properdocs build` instead of the MkDocs equivalents.

Alternatively, to just skip this warning in the future, you can set the environment variable `DISABLE_MKDOCS_2_WARNING=true`.

For more info visit https://github.com/ProperDocs/properdocs/discussions/33 and https://properdocs.org/

(This warning was initiated by one of the plugins that you depend on.)

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[joonas-somero]

It seems that Travis will not settle for an environment variable. What do you think, @lvarin, should we go for ProperDocs for now?

[lvarin]

If the warning is true, ProperDocs is the only alternative IMHO.

[joonas-somero]

We'll go with ProperDocs and MaterialX.