Bring Cabal files in sync with Flaky template Notably, this uses `GHC2021` as the `default-language` and fixes the `setup-depends` bounds for Cabal (which would have prevented publishing to Hackage).
| Time to Start | Worker time | Duration | Time to finish | |
| Config | 0s | 1s | 1s | 1s |
| Eval | 1s | 2m16s | 2m16s | 2m17s |
| Build | 2m17s | 9m43s | 10m32s | 12m50s |
| Suite | 0s | 12m00s | 12m50s | 12m50s |