chore(deps): update dependency giantswarm/architect to v7.5.1

[renovate]

This PR contains the following updates:

Package	Update	Change
giantswarm/architect	minor	v7.4.0 → v7.5.1

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Release Notes

giantswarm/architect (giantswarm/architect)

v7.5.1

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Changed

• Update cosign to v3.0.6.

v7.5.0

Compare Source

Added

• Install cosign (sigstore) in the image. Used by architect-orb for keyless image/chart/binary signing, so the orb no longer has to download cosign per-run.
• Install hadolint in the image — Dockerfile linter. Enables a hadolint command in architect-orb without per-run downloads.

Changed

• Extract gh-token version into a renovate-tracked GH_TOKEN_VERSION ARG, matching every other binary in the image.
• Drop redundant apk update from the Alpine package install — apk add --no-cache already fetches a fresh index.
• Move xtrace into the SHELL directive (bash -xc) so subsequent RUN commands are actually traced; the previous RUN set -o xtrace only set the option for a one-shot shell that exited immediately.
• Replace chmod 600 ~/.ssh/* with an explicit list of known_hosts and config so the step doesn't break if ~/.ssh/ ever ends up empty.
• Install kubeconform from its upstream pre-built release tarball instead of compiling from source with go install. Upstream ships kubeconform-linux-amd64.tar.gz / kubeconform-linux-arm64.tar.gz already. Eliminates the Go toolchain run during the image build (no QEMU emulation under buildx cross-arch, no source dependency tree to resolve).

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