add OSS Index authentication to dependency-check

[thpierce]

Sonatype OSS Index now requires authentication. Without credentials, dependency-check fails with exit code 14 due to rate limiting.

Validated in aws/aws-xray-daemon#272
Passing run: https://github.com/aws/aws-xray-daemon/actions/runs/23265738194/job/67645958161 ("[INFO] Finished Sonatype OSS Index Analyzer (0 seconds)")

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.31%. Comparing base (98c3fb3) to head (6090275).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #747   +/-   ##
=======================================
  Coverage   84.31%   84.31%           
=======================================
  Files          36       36           
  Lines        1817     1817           
=======================================
  Hits         1532     1532           
  Misses        285      285           

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