Nicer 403 error andling when downloading grype #8611

Job	Run time
CodeQL-Build (go, ubuntu-latest)	2m 53s
CodeQL-Build (c, macos-latest)	9m 41s
CodeQL-Build (python, ubuntu-latest)	1m 36s
CodeQL-Build (c, ubuntu-latest)	3m 59s
CodeQL-Build (actions, ubuntu-latest)	43s
	18m 52s

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