iwyu.yml: switched to Fedora to get the latest include-what-you-use / cleaned up includes
#12044
| Job | Run time |
|---|---|
| 10m 0s | |
| 10m 0s |
include-what-you-use / cleaned up includes
#12044
| Job | Run time |
|---|---|
| 10m 0s | |
| 10m 0s |