chore: Pin shellcheck image
What does this MR do?
The shellcheck image was recently bumped to v0.72 which resulted in master:broken, see example https://gitlab.com/gitlab-org/security-products/security-report-schemas/-/jobs/1216701213
We could also fix these too but it's a bit of a moving target and I'm not convinced syntax is so variable it requires frequent updates.
Availability and Testing
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Review and add/update tests for this feature/bug