(MINOR) updates to c2pa-rs v0.28.2

[dyro]

Changes in this pull request

Will be used by the express / pdf team to test PDFs signed by express.

Checklist

• [x] This PR represents a single feature, fix, or change.
• [x] All applicable changes have been documented.
• [x] Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (10fc69e) 83.91% compared to head (2e9e955) 83.91%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #153 +/- ## ======================================= Coverage 83.91% 83.91% ======================================= Files 3 3 Lines 373 373 ======================================= Hits 313 313 Misses 60 60 ```

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