test: unmark flaky from test_non_printable_key_sends_events
#8690
| Job | Run time |
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| 3m 59s | |
| 3m 20s | |
| 3m 47s | |
| 3m 30s | |
| 3m 17s | |
| 3m 12s | |
| 4m 25s | |
| 3m 11s | |
| 3m 27s | |
| 3m 22s | |
| 3m 15s | |
| 3m 52s | |
| 5m 47s | |
| 5m 29s | |
| 5m 38s | |
| 4m 25s | |
| 3m 38s | |
| 4m 56s | |
| 1s | |
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| 1h 12m 31s |