Update dependency architect to v5.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
architect (source)	orb	minor	5.5.1 -> 5.6.0

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Release Notes

giantswarm/architect-orb (architect)

v5.6.0

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Changed

• Bump architect to v6.18.0, which uses Go v1.23.0

v5.5.2

Compare Source

Removed

• In command go-test...
  • remove the step that executes go vet, as the same checks are also run by golangci-lint
  • move the go test step up to get executed before golangci-lint, for reduced runtime.
  • Add cache for golangci-lint

Changed

• In command go-test, the golangci-lint call is no longer limited to a certain number of issues per linter (max-issues-per-linter is now 0).
• In command go-test, use the environment key for setting environment variables.

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