[BUG] pd dev and pd deploy fail to deploy source with additionalProps

**Describe the bug**
> So, in a source event, if we have async props within additionalProps() method, on running pd dev, these async additional props seem to get skipped somehow and pd dev fails as a result.

Source: [Slack message](https://pipedream-users.slack.com/archives/CPTJYRY5A/p1658850210657769)

**To Reproduce**
Run the command:
```
pd deploy https://github.com/PipedreamHQ/pipedream/tree/actions-and-triggers-convertkit/components/convertkit/sources/webhook-events
```

**Expected behavior**
I am able to configure the source's static props and dynamic props and deploy the source to my account.

**Workaround**
I can publish my source using the [`pd publish`](https://pipedream.com/docs/cli/reference/#pd-publish) command and configure it on https://pipedream.com/sources after enabling "my sources" on https://pipedream.com/alpha.