Invalid regex generated when glob includes comma and character class

The following call fails in `minimatch 10.1.1`:
```
> minimatch('foo', ',[[:space:]]')
SyntaxError: Invalid regular expression: /^\,[\p{Z}\t\r\n\v\f]$/u: Invalid escape
```

(The actual glob where I ran into this is more complex of course, and the comma usage therein makes more sense, but I figured a minimal repro would be better to report the issue.)
