`quality-of-service` fails to halt operations when off quota

[yegor256]

Look at this log: https://github.com/jcabi/jcabi/actions/runs/16435031256/job/46443357346

We must avoid such situation when we are off quota. Instead, we must stop the judge before this happens.

[yegor256]

@rultor release, tag is 0.15.9

[rultor]

@rultor release, tag is 0.15.9

@yegor256 OK, I will release it now. Please check the progress here.

[rultor]

@rultor release, tag is 0.15.9

@yegor256 Done! FYI, the full log is here (took me 15min).