Speed up _notify_conda_outdated due to expensive PrefixData call.
#840
| Job | Run time |
|---|---|
| 29m 49s | |
| 31m 30s | |
| 25m 25s | |
| 26m 36s | |
| 32m 15s | |
| 24m 5s | |
| 35m 6s | |
| 48m 38s | |
| 22m 23s | |
| 3s | |
| 9s | |
| 0s | |
| 4h 35m 59s |