Update architect orb to v5.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
architect (source)	orb	minor	5.0.1 -> 5.1.0

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Release Notes

giantswarm/architect-orb (architect)

### [`v5.1.0`](https://togithub.com/giantswarm/architect-orb/blob/HEAD/CHANGELOG.md#510---2024-02-23) [Compare Source](https://togithub.com/giantswarm/architect-orb/compare/v5.0.1...v5.1.0) ##### Changed - Update machine executor image to `default`.

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