mark test_hdf5_filters as flaky

[valeriupredoi]

Description

Avoids #140 (100% statistically, given flaky = up to 3 reruns), but does not solve it.

Before you get started

• ☝ Create an issue to discuss what you are going to do

Checklist

• This pull request has a descriptive title and labels
• This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• Unit tests have been added (if codecov test fails)
• Any changed dependencies have been added or removed correctly (if need be)
• If you are working on the documentation, please ensure the current build passes
• All tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.66%. Comparing base (fe911ef) to head (063bac5).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #141   +/-   ##
=======================================
  Coverage   74.66%   74.66%           
=======================================
  Files          12       12           
  Lines        2712     2712           
  Branches      407      407           
=======================================
  Hits         2025     2025           
  Misses        576      576           
  Partials      111      111           

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