Update GitHub Actions (major)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v3
actions/setup-dotnet	action	major	v1 -> v3
actions/stale	action	major	v3 -> v6
codecov/codecov-action	action	major	v2 -> v3

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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/setup-dotnet

### [`v3`](https://togithub.com/actions/setup-dotnet/compare/v2...v3) [Compare Source](https://togithub.com/actions/setup-dotnet/compare/v2...v3) ### [`v2`](https://togithub.com/actions/setup-dotnet/compare/v1...v2) [Compare Source](https://togithub.com/actions/setup-dotnet/compare/v1...v2)

actions/stale

### [`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)

codecov/codecov-action

### [`v3`](https://togithub.com/codecov/codecov-action/compare/v2...v3) [Compare Source](https://togithub.com/codecov/codecov-action/compare/v2...v3)

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Configuration

📅 Schedule: Branch creation - "before 9am on Monday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.

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• [ ] If you want to rebase/retry this PR, check this box

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This PR has been generated by Mend Renovate. View repository job log here.

[codecov[bot]]

Codecov Report

Merging #76 (ebb6bd4) into main (155f015) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   81.42%   81.42%           
=======================================
  Files          20       20           
  Lines         716      716           
  Branches      100      100           
=======================================
  Hits          583      583           
  Misses         90       90           
  Partials       43       43           

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[github-actions[bot]]

Automatically marking pull request as stale due to lack of activity

[github-actions[bot]]

Automatically closing this pull request as stale