Fix python 3.13 deprecation of typing.re

In python 3.13, `typing.re` was removed (deprecated since Python 3.8). See python/cpython#92871

This pr refactors to support python 3.13 which currently throws

```python
ImportError: cannot import name 're' from 'typing' 
```

Author: nicholsn

linkml_runtime/utils/slot.py

@@ -1,5 +1,6 @@
 from dataclasses import dataclass
-from typing import Type, List, Optional, Any, re
+import re
+from typing import Type, List, Optional, Any
 
 from rdflib import URIRef