Update dependency mike to v2.1.0

This MR contains the following updates:

Package	Update	Change
mike	minor	==2.0.0 -> ==2.1.0

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Release Notes

jimporter/mike (mike)

v2.1.0

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New features

• When calling set-default, you can now pass --allow-undefined to set the default to a version that doesn't exist yet
• Add global-level -q / --quiet option to suppress warning messages
• Add support for handling !relative in mkdocs.yml

Bug fixes

• When loading an MkDocs config, mike now runs the startup and shutdown events

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