UUID constructor accept string with too many dashes or keyword like urn: / uuid:

For eg, this code do not raise

```
>>> import uuid
>>> uuid.UUID('0be--468urn:urn:urn:urn:54-4bf9-41----------d4-9697-41d735uuid:4fbe85uuid:')
UUID('0be46854-4bf9-41d4-9697-41d7354fbe85')
```

For the context, we use a validator based on `uuid.UUID` for an API.
Some customer send string with a UUID followed by extra `-`, the validator let it pass but the sql connector raise an exception

We workaround this in our validator, but UUID constructor should not accept string like the one in exemple