fix: remove warning for macOS 11.7 (#805)

This commit should fix the case where warning appears on macOS 11.7

```
2022-10-16 21:11:25,014 - WARNING - photosdb.py - 119 - WARNING: This module has only been tested with macOS versions [10.12, 10.13, 10.14, 10.15, 10.16, 11.0, 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 12.0, 12.1, 12.2, 12.3, 12.4, 12.5, 12.6]: you have Darwin, OS version: 11.7
```

macOS 11.7 fixes only security patches as i known and i'm did not noticed any new feature or broken feature, so i think it should work

osxphotos/_constants.py

@@ -113,6 +113,7 @@ _TESTED_OS_VERSIONS = [
     ("11", "4"),
     ("11", "5"),
     ("11", "6"),
+    ("11", "7"),
     ("12", "0"),
     ("12", "1"),
     ("12", "2"),