chore(deps): update dependency mike to v2.1.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mike	2.0.0 -> 2.1.2

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Release Notes

jimporter/mike (mike)

v2.1.2

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Bug fixes

• Remove ambiguity of some Git commands so that file and branch names don't
  collide

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v2.1.1

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Bug fixes

• Support using environment variables for INHERIT when injecting the mike
  plugin into mkdocs.yml

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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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