## Bug description

strtobool is used in several places where it will cause deprecation warning in Pythin 3.10 and error in Python 3.12 since distutils will be removed in Python 3.12 .

Reference : https://www.python.org/dev/peps/pep-0632/

```
rg distutils                     
posthog/api/annotation.py
1:from distutils.util import strtobool

posthog/api/dashboard.py
2:from distutils.util import strtobool

posthog/api/insight.py
1:from distutils.util import strtobool

posthog/models/filters/mixins/common.py
4:from distutils.util import strtobool

posthog/settings.py
17:from distutils.util import strtobool
```

## Expected behavior

It's a good idea to vendor in the function as it's a short one.

## Environment

- [ ] PostHog Cloud
- [ ] self-hosted PostHog, version/commit: _please provide_


#### *Thank you* for your bug report – we love squashing them!

posthog/api/dashboard.py
items = serializers.SerializerMethodField()
    created_by = UserBasicSerializer(read_only=True)
    use_template = serializers.CharField(write_only=True, allow_blank=True, required=False)
    class Meta:
        model = Dashboard
        fields = [
            "id",
            "name",
            "description",
            "pinned",
            "items",
            "created_at",
            "created_by",
            "is_shared",
            "share_token",
            "deleted",
            "creation_mode",
            "use_template",
            "filters",
            "tags",
        ]
        read_only_fields = ("creation_mode",)
    def create(self, validated_data: Dict, *args: Any, **kwargs: Any) -> Dashboard: