Bump mockito to 02ad6c793d9ea970b5cc892f45a55d12d8ebf4e8
Bump mockito to 02ad6c793d9ea970b5cc892f45a55d12d8ebf4e8

Changes:
```
> git log --format="%C(auto) %h %s" ef37e87..02ad6c7
 https://dart.googlesource.com/mockito.git/+/02ad6c7 Bump analyzer to support 5.0.0

```

Diff: https://dart.googlesource.com/mockito.git/+/ef37e871d2673a66ca57303253901748622f04ca~..02ad6c793d9ea970b5cc892f45a55d12d8ebf4e8/
Change-Id: I460fef009a9a2819e654e3d41a2513c99b5bfa8b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/261202
Commit-Queue: Samuel Rawlins <5cf2cac5eec2ad6d0eb2b0f4ff6af9a590ce2bf6@google.com>
Reviewed-by: Samuel Rawlins <5cf2cac5eec2ad6d0eb2b0f4ff6af9a590ce2bf6@google.com>
Auto-Submit: Devon Carew <e996497f4f2225f0ee7a9f4d1696ee710b488b66@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk