Fix xliff regeneration (#19092)
### Link to issue number:
<!-- Use Closes/Fixes/Resolves #xxx to link this PR to the issue it is
responding to. -->
Fixes #19023
Replaces pr #19054
### Summary of the issue:
The GitHub action that regenerates updated xliff files for translation,
from English user documentation is currently broken, as the ssh
credentials uses an out-of-date key.
### Description of user facing changes:
### Description of developer facing changes:
### Description of development approach:
The GitHub action now uses a GitHub Personal Access Token (PAT) that has
permission to push to the repository, and will still trigger future
actions.
### Testing strategy:
* [x] Run and ensure it successfully pushes to the pr branch, by
temporarily listing the pr branch for the action.
* [ ] Once merged to beta, ensure the action correctly runs.
### Known issues with pull request:
None known.
### Code Review Checklist:
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Check items to confirm you have thought about the relevance of the item.
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- [x] Documentation:
- Change log entry
- User Documentation
- Developer / Technical Documentation
- Context sensitive help for GUI changes
- [x] Testing:
- Unit tests
- System (end to end) tests
- Manual testing
- [x] UX of all users considered:
- Speech
- Braille
- Low Vision
- Different web browsers
- Localization in other languages / culture than English
- [x] API is compatible with existing add-ons.
- [x] Security precautions taken.
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