## Bug description

Sites built with Tailwind use a lot of classes like: `text-base leading-6 font-medium text-gray-500 hover:text-gray-900 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150` 

The problem is with the ones that have a colon (`:`) inside them. Simmerjs crashes with the following:

```
Failed to execute 'querySelectorAll' on 'Document': 'A.text-base.leading-6.text-gray-400.hover:text-gray-500.hover:text-white' is not a valid selector
```

... bringing down the entire toolbar.

## Expected behavior

The toolbar shouldn't crash when your page contains a CSS class with a colon in it.

https://stackoverflow.com/questions/45110893/select-elements-by-attributes-with-colon

## How to reproduce

1. Make a page with a `<button />` that has a class `with:colon`.
2. Wait for a few events to be captured or click the button yourself
3. Open the toolbar, click "heatmap" and watch it burst up in flames (and then crash)

posthog/models/event.py
groups = ElementGroup.objects.filter(team_id=team_id)
        if filters.get("selector"):
            selector = Selector(filters["selector"])
            subqueries, filter = self._element_subquery(selector)
            groups = groups.annotate(**subqueries)  
        else:
            filter = {}
        for key in ["tag_name", "text", "href"]:
            if filters.get(key):
                filter["element__{}".format(key)] = filters[key]
        if not filter:
            return {}
        groups = groups.filter(**filter)
        return {"elements_hash__in": groups.values_list("hash", flat=True)}
    def filter_by_url(self, action_step: ActionStep, subquery: QuerySet):