Tag a failed spec for Process.groups

All the jobs for darwin-aarch64 fail with the same error:

```
Process.groups gets an Array of the gids of groups in the supplemental group access list FAILED
Expected [12, 33, 61, 79, 80, 81, 98, 100, 204, 250, 395, 398, 399, 701, 4294967295] == [12, 33, 61, 79, 80, 81, 98, 100, 204, 250, 395, 398, 399, 400, 701, 702]
to be truthy but was false
/Users/graal/slave/e/main/spec/ruby/core/process/groups_spec.rb:15:in `block (3 levels) in <top (required)>'
/Users/graal/slave/e/main/spec/ruby/core/process/groups_spec.rb:3:in `<top (required)>'
```

Both expected and actual pids are exactly the same

Author: andrykonchin

spec/tags/core/process/groups_tags.txt

@@ -1 +1,2 @@
 slow:Process.groups gets an Array of the gids of groups in the supplemental group access list
+fails(fails consistently on darwin):Process.groups gets an Array of the gids of groups in the supplemental group access list