RHEL 8.8 blocks CI

Building on RHEL 8.8 times out.

Example: https://codereview.qt-project.org/c/qt/qtbase/+/518593

Error message:
138001: Average cache read miss 0.163 s
Average cache read hit 0.002 s
Failed distributed compilations 0
Cache location S3, bucket: Bucket(name=cache, base_url=http://ci-sccache:9000/cache/)
agent:2023/11/16 07:23:05 build.go:763:
Executing scheduled instruction 3 of 3 - Upload test results
Collecting test results, archiving and uploading them
Collecting 586 test results ...
agent:2023/11/16 07:23:07 build.go:763:
Test failed
ERROR building: Timeout after 15m0s: No output received