Update used GitHub actions

[Earlopain]

They show deprecation notices for old Node versions.

There are no relevant breaking changes between these major versions, except for the bump of node.

• https://github.com/release-drafter/release-drafter/releases/tag/v6.0.0
• https://github.com/actions/checkout/releases/tag/v4.0.0
• https://github.com/actions/checkout/releases/tag/v3.0.0

https://github.com/guard/listen/actions/runs/8075253923

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2.