build(deps): bump actions/checkout from 4.2.2 to 7.0.0 - #3

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: msys2/setup-msys2@7efe20baefed56359985e327d329042cde2434ff. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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