test: cosign bump

[JossWhittle]

🚧 Suggest a change

Tests SwanseaUniversityMedical/workflows#191

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• 💹 Have all required CI checks passed on the most recent commit?
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✒️ PR Title Commitlint - ✔️ Lint success!

[github-actions]

🛠️ 🐳 Build PR Container - controller-container - 🏷️ Commit: b3a33be - ⚙️ Workflow: 11263180080

harbor.ukserp.ac.uk/github-workflows-test/controller:pr-177
harbor.ukserp.ac.uk/github-workflows-test/controller:pr-177-b3a33be
sha256:c542cbe3c3b65c103a527ca0df560d871992dd8d3f9990711e167011327312d7