packit: don't propose downstream update

[MartinBasti]

We are not there yet, packit only creates issues github about failures

Signed-off-by: Martin Bašti mbasti@redhat.com

Maintainers will complete the following section:

• [x] Commit messages are descriptive enough
• [x] "Signed-off-by:" line is present in each commit
• [x] Code coverage from testing does not decrease and new code is covered
• [x] JSON/YAML configuration changes are updated in the relevant schema
• [ ] Pull request includes link to an osbs-docs PR for user documentation updates