fix: Update hardening_manifest maintainer from Steven Terhar to Andrew Dunn

Summary

Steven Terhar (@sterhar) is transitioning and Andrew Dunn (@andunn) should be listed as the primary maintainer in the hardening manifest metadata.

What changed

In release-helper.sh, the updateManifest() function sets maintainer fields via yq eval into each image's hardening_manifest.yaml. This MR updates:

Field Before After
email sterhar@gitlab.com andunn@gitlab.com
name Steven Terhar Andrew Dunn
username sterhar andunn

Affects all 16 container images produced by the release pipeline.

Closes #109 (closed)

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