fix(nvd_api): nvd_api fetch results over 2000 limit

[imsahil007]

This will fix failing NVD REST API tests.

[codecov-commenter]

Codecov Report

Merging #1345 (d56a457) into main (8574d8f) will decrease coverage by 0.20%.
The diff coverage is 54.60%.

@@            Coverage Diff             @@
##             main    #1345      +/-   ##
==========================================
- Coverage   79.31%   79.11%   -0.21%     
==========================================
  Files         271      274       +3     
  Lines        4908     5017     +109     
  Branches      593      607      +14     
==========================================
+ Hits         3893     3969      +76     
- Misses        866      889      +23     
- Partials      149      159      +10     

Flag	Coverage Δ
longtests	79.11% <54.60%> (-0.21%)	⬇️

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Impacted Files	Coverage Δ
cve_bin_tool/helper_script.py	41.29% <24.65%> (-2.83%)	⬇️
cve_bin_tool/cli.py	73.29% <40.00%> (-0.98%)	⬇️
cve_bin_tool/backports/debian_backports.py	78.57% <78.57%> (ø)
cve_bin_tool/backports/__init__.py	82.14% <82.14%> (ø)
test/test_backports.py	84.61% <84.61%> (ø)
test/test_nvd_api.py	89.79% <100.00%> (+0.43%)	⬆️
cve_bin_tool/cvedb.py	82.30% <0.00%> (+0.29%)	⬆️

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