Setup mkr

Version updated for susisu/setup-mkr to version v3.1.0.

• This action is used across all versions by 0 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

• Add a sanity check for download URLs so that the tool is downloaded only from the known locations i.e. https://github.com/mackerelio/mkr/releases/download/*
• Upgrade dependencies

Full Changelog: https://github.com/susisu/setup-mkr/compare/v3.0.5...v3.1.0

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