Update github actions

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	3df4ab1 -> 8ade135
golang (source)		minor	1.20.6 -> 1.21.3

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Release Notes

golang/go (golang)

### [`v1.21.3`](https://togithub.com/golang/go/compare/go1.21.2...go1.21.3) ### [`v1.21.2`](https://togithub.com/golang/go/compare/go1.21.1...go1.21.2) ### [`v1.21.1`](https://togithub.com/golang/go/compare/go1.21.0...go1.21.1) ### [`v1.21.0`](https://togithub.com/golang/go/compare/go1.20.8...go1.21.0) ### [`v1.20.10`](https://togithub.com/golang/go/compare/go1.20.9...go1.20.10) ### [`v1.20.9`](https://togithub.com/golang/go/compare/go1.20.8...go1.20.9) ### [`v1.20.8`](https://togithub.com/golang/go/compare/go1.20.7...go1.20.8) ### [`v1.20.7`](https://togithub.com/golang/go/compare/go1.20.6...go1.20.7)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), 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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