Fix flaky OGG/MATROSKA test downloads

[ViralBShah]

Summary

• The try_download helper in tests caught only Downloads.RequestError, but this type check failed on some Julia versions when wikimedia returned HTTP 429 (rate limit)
• Changed to catch all exceptions, since any download failure should gracefully skip the test via @test_skip
• Fixes the CI failures seen in Bump codecov/codecov-action from 5 to 6 #429 (and likely other PRs hitting the same wikimedia rate limiting)

Test plan

• CI passes on all Julia versions (1.6, lts, nightly)
• OGG/MATROSKA tests either pass (successful download) or skip gracefully (download failure)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.44%. Comparing base (4e544bd) to head (d3f4a60).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #432   +/-   ##
=======================================
  Coverage   91.44%   91.44%           
=======================================
  Files          11       11           
  Lines         713      713           
=======================================
  Hits          652      652           
  Misses         61       61           

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