Add the .git subdir as another safe.directory on Cygwin CI
#1846
| Job | Run time |
|---|---|
| 2m 18s | |
| 2m 23s | |
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| 1m 35s | |
| 2m 1s | |
| 1m 39s | |
| 5m 38s | |
| 5m 34s | |
| 6m 0s | |
| 6m 34s | |
| 5m 47s | |
| 5m 24s | |
| 1h 16m 15s |