fix: improve nbd checker

[ffontaine]

Update nbd pattern to avoid false positive with upcoming linux_kernel checker

[codecov-commenter]

Codecov Report

Merging #2715 (95b5724) into main (d750703) will increase coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2715      +/-   ##
==========================================
+ Coverage   82.02%   82.25%   +0.23%     
==========================================
  Files         640      640              
  Lines        9999     9999              
  Branches     1334     1334              
==========================================
+ Hits         8202     8225      +23     
+ Misses       1444     1437       -7     
+ Partials      353      337      -16     

Flag	Coverage Δ
longtests	82.25% <ø> (+5.22%)	⬆️
win-longtests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cve_bin_tool/checkers/nbd.py	100.00% <ø> (ø)
cve_bin_tool/extractor.py	69.02% <0.00%> (-11.51%)	⬇️
cve_bin_tool/data_sources/redhat_source.py	62.91% <0.00%> (-7.29%)	⬇️
test/test_checkers.py	93.87% <0.00%> (-6.13%)	⬇️
cve_bin_tool/version_scanner.py	86.95% <0.00%> (-3.73%)	⬇️
cve_bin_tool/cve_scanner.py	77.90% <0.00%> (-3.49%)	⬇️
cve_bin_tool/output_engine/console.py	93.60% <0.00%> (-1.61%)	⬇️
cve_bin_tool/cli.py	66.56% <0.00%> (-1.28%)	⬇️
cve_bin_tool/output_engine/__init__.py	67.85% <0.00%> (-1.08%)	⬇️
cve_bin_tool/data_sources/nvd_source.py	56.04% <0.00%> (-0.81%)	⬇️
... and 15 more

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[terriko]

Interesting change. Thanks!