Update pallets-sphinx-themes requirement from ~=2.0 to ~=2.1 in /requirements

[dependabot[bot]]

Updates the requirements on pallets-sphinx-themes to permit the latest version.

Release notes

Sourced from pallets-sphinx-themes's releases.

2.1.0

• Drop Python 3.6 and 3.7
• Drop Sphinx < 3
• Fix table of contents overflow issue

Changelog

Sourced from pallets-sphinx-themes's changelog.

Version 2.1.0

Released 2023-04-25

• Drop support for Python 3.6 and 3.7.
• Require Sphinx >= 3.
• Remove previously deprecated code.
• Fix table of contents overflow issue.

Version 2.0.3

Released 2022-12-24

• Fix compatibility with packaging>=22.

Version 2.0.2

Released 2021-11-10

• Detect if Sphinx dirhtml builder is generating canonical URLs with ".html" and replace with the correct dir URL. :issue:47
• canonical_url config is deprecated. Use Sphinx's built-in html_baseurl config instead. :pr:53
• Address deprecations in Jinja 2.0. :pr:54

Version 2.0.1

Released 2021-05-20

• Remove workaround for search URLs when using the dirhtml builder. The issue has been fixed in Sphinx and the workaround was causing the issue again. :issue:39
• Remove html_context["readthedocs_docsearch"] for controlling whether Read the Docs' search is used. :issue:40
• Add an ethicalads.html sidebar to have Read the Docs always show ads in the sidebar instead of other possible locations. The sidebar is enabled by default at the end of the list. :issue:41

Version 2.0.0

Released 2021-05-11

... (truncated)

Commits

• c369897 release version 2.1.0
• 454dac3 remove previously deprecated code
• 839c413 drop python 3.6 and 3.7
• 75e62fb remove old links
• 44ea538 update dev dependencies
• f8b91b7 Merge pull request #63 from flying-sheep/patch-1
• 1e6ed12 Merge pull request #67 from pallets/dependabot/pip/requirements/wheel-0.38.1
• 7ffd1c8 Merge pull request #65 from jmg-duarte/fix/64
• 1609816 Bump wheel from 0.37.0 to 0.38.1 in /requirements
• 76476ff Merge branch '2.0.3-dev'
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0bd292e) 97.52% compared to head (4708a6b) 97.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #787 +/- ## ======================================= Coverage 97.52% 97.52% ======================================= Files 34 34 Lines 4453 4453 ======================================= Hits 4343 4343 Misses 110 110 ```

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