Update Actions (major)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v3
actions/stale	action	major	v3 -> v7

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Release Notes

actions/checkout

### [`v3`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v310) [Compare Source](https://togithub.com/actions/checkout/compare/v2...v3) - [Use @​actions/core `saveState` and `getState`](https://togithub.com/actions/checkout/pull/939) - [Add `github-server-url` input](https://togithub.com/actions/checkout/pull/922)

actions/stale

### [`v7`](https://togithub.com/actions/stale/compare/v6...v7) [Compare Source](https://togithub.com/actions/stale/compare/v6...v7) ### [`v6`](https://togithub.com/actions/stale/compare/v5...v6) [Compare Source](https://togithub.com/actions/stale/compare/v5...v6) ### [`v5`](https://togithub.com/actions/stale/compare/v4...v5) [Compare Source](https://togithub.com/actions/stale/compare/v4...v5) ### [`v4`](https://togithub.com/actions/stale/compare/v3...v4) [Compare Source](https://togithub.com/actions/stale/compare/v3...v4)

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[kitchen-porter]

Released as: 8.1.6