Upgrading UniFFI to 0.25.1

[bendk]

do not merge because I think this should wait until Glean also updates to 0.25.1

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
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• Quality: This PR builds and tests run cleanly
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• Tests: This PR includes thorough tests or an explanation of why it does not
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Branch builds: add [firefox-android: branch-name] to the PR title.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (64033af) 25.85% compared to head (bf7797d) 19.08%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5912      +/-   ##
==========================================
- Coverage   25.85%   19.08%   -6.78%     
==========================================
  Files         375      364      -11     
  Lines       47754    44928    -2826     
==========================================
- Hits        12349     8574    -3775     
- Misses      35405    36354     +949     

see 30 files with indirect coverage changes

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