add .txt data files to manifest

[atravitz]

Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.88%. Comparing base (3ba06b5) to head (9337411).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1608      +/-   ##
==========================================
- Coverage   95.33%   92.88%   -2.45%     
==========================================
  Files         183      183              
  Lines       15765    15765              
==========================================
- Hits        15030    14644     -386     
- Misses        735     1121     +386     

Flag	Coverage Δ
fast-tests	92.88% <ø> (?)
slow-tests	?

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