fix: rename development requirements file for Snyk

[terriko]

• related to dev-recommended.txt -- should we be scanning dev requirements for known vulns? #1270

Snyk picks up files named *req*.txt so we're switching
dev-recommended.txt to dev-requirements.txt so it gets scanned
automatically.

[codecov-commenter]

Codecov Report

Merging #1272 (59079d1) into main (4449279) will decrease coverage by 1.51%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1272      +/-   ##
==========================================
- Coverage   80.74%   79.22%   -1.52%     
==========================================
  Files         252      252              
  Lines        4564     4564              
  Branches      557      557              
==========================================
- Hits         3685     3616      -69     
- Misses        741      802      +61     
- Partials      138      146       +8     

Flag	Coverage Δ
longtests	79.22% <ø> (-1.52%)	⬇️

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

Impacted Files	Coverage Δ
cve_bin_tool/checkers/xml2.py	61.36% <0.00%> (-27.28%)	⬇️
test/test_json.py	68.96% <0.00%> (-20.69%)	⬇️
test/test_scanner.py	61.71% <0.00%> (-12.50%)	⬇️
test/test_cli.py	81.28% <0.00%> (-11.83%)	⬇️
cve_bin_tool/checkers/glibc.py	95.83% <0.00%> (-4.17%)	⬇️
cve_bin_tool/cli.py	75.15% <0.00%> (-3.04%)	⬇️
cve_bin_tool/version_scanner.py	76.38% <0.00%> (-1.39%)	⬇️
cve_bin_tool/cvedb.py	84.39% <0.00%> (-0.96%)	⬇️

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