**Backport:** https://codeberg.org/forgejo/forgejo/pulls/11997Fixes#11968.
Adds deadlocks to the package `RetryTx` operations, and bumps the attempt count to 3. Technically this affects production code, not just test code, but the resulting failure is only likely to occur in highly concurrent operations when uploading packages to the debian registry for the first time for a user, which is more of a test artifact than a production likelihood.
Manually tested by modifying the `Makefile` to add the `-test.count=25` option to the test command. This failed consistently on my dev system before this change, failed consistently after the deadlock err was added, and then succeeded consistently (multiple runs) after both changes were combined, giving me confidence that the intermittent failure is squashed.
## Checklist
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### Tests for Go changes
- I added test coverage for Go changes...
- [ ] in their respective `*_test.go` for unit tests.
- [x] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- Fixing a test failure, so no new tests added, but they already failed.
- I ran...
- [x] `make pr-go` before pushing
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [ ] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [x] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11998
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
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