fix: prefer cerberus resolved version in versionware

[tinygrasshopper]

• Update the middleware to choose the snyk version served header when found
• Header set in https://github.com/snyk/cerberus/blob/1e5cd96dbe5b807106b4c41b3a0983c1e61805fe/internal/filter/versionheader.go#L29

[tinygrasshopper]

Version information from cerb is not percolated down today