Fix parsing DFN-Cert CVE entries

[swaterkamp]

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1965 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1965   +/-   ##
=======================================
  Coverage   50.59%   50.59%           
=======================================
  Files        1065     1065           
  Lines       25368    25368           
  Branches     7144     7171   +27     
=======================================
  Hits        12835    12835           
  Misses      11384    11384           
  Partials     1149     1149

Impacted Files	Coverage Δ
gsa/src/gmp/models/dfncert.js	100% <100%> (ø)	⬆️

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