Add new data source https://vulnerabilities.ncsc.nl/

[pombredanne]

See https://vulnerabilities.ncsc.nl/vulnerability.html?id=2025/cve-2025-5115

These are available as CSAF at https://vulnerabilities.ncsc.nl/csaf/v2/ the hard part being to decide if this data is entirely redundant or not with other data sources.

See also:

• license at New license request: Dutch NCSC NL disclaimer scancode-toolkit#4955