[CVEDB] Fixes #4578(metric_finder function returns "unknown" #7519

Job	Run time
Linux tests (3.9)	1m 25s
Documentation	3m 7s
Linux tests (3.11)	3m 7s
Long tests on Python 3.10	1m 32s
Linux tests (3.12)	2m 13s
Long tests on Python 3.10 (language parsers)	1m 17s
Long tests on Python 3.10 (scanners)	1m 33s
Tests that may fail due to network or HTML	3m 50s
Long tests on Python 3.10 (synchronous)	1m 20s
Windows long tests	10m 28s
	29m 52s

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