fix Kotlin master (3.0) test failures -- due to MapperFeature.ALLOW_FINAL_FIELDS_AS_MUTATORS default change;
#616
| Job | Run time |
|---|---|
| 1m 20s | |
| 1m 18s | |
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| 1m 25s | |
| 1m 21s | |
| 1m 8s | |
| 1m 2s | |
| 1m 7s | |
| 1m 7s | |
| 1m 13s | |
| 1m 5s | |
| 1m 16s | |
| 1m 9s | |
| 1m 10s | |
| 1m 7s | |
| 18m 11s |