Resolve "Drop the `fingerprint` column from `sbom_sources`"

What does this MR do and why?

Simply drop the fingerprint column from the sbom_sources table, as this has been determined to be no longer in use and safe to remove.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #374558 (closed)