deps(deps-dev): update mkdocs requirement from >=1.5 to >=1.6.1

[dependabot]

Updates the requirements on mkdocs to permit the latest version.

Release notes

Sourced from mkdocs's releases.

1.6.1

Version 1.6.1 (Friday 30th August, 2024)

Fixed

• Fix build error when environment variable SOURCE_DATE_EPOCH=0 is set. #3795
• Fix build error when mkdocs_theme.yml config is empty. #3700
• Support python -W and PYTHONWARNINGS instead of overriding the configuration. #3809
• Support running with Docker under strict mode, by removing 0.0.0.0 dev server warning. #3784
• Drop unnecessary changefreq from sitemap.xml. #3629
• Fix JavaScript console error when closing menu dropdown. #3774
• Fix JavaScript console error that occur on repeated clicks. #3730
• Fix JavaScript console error that can occur on dropdown selections. #3694

Added

• Added translations for Dutch. #3804
• Added and updated translations for Chinese (Simplified). #3684

Commits

• bb7e8b6 Version 1.6.1. (#3819)
• 0b22a52 Merge pull request #3795 from mkdocs/tomchristie-patch-1
• 695d8ed Merge pull request #3808 from razorblack/master
• 347e79f Merge pull request #3817 from gesslar/patch-1
• 200f6f9 Update configuration.md
• 05a64b4 Use utc timezones consistently
• 9204eb6 Merge pull request #3809 from pawamoy/warnings-control
• a16d60f Merge pull request #3804 from KenSentMe/master
• e72c7d0 Merge pull request #3784 from squidfunk/fix/docker-warning
• d737625 Merge pull request #3774 from squidfunk/fix/dropdown
• Additional commits viewable in compare view

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