Fix package names in ConnectorJobHandler example

[itsmestefanjay]

Description

I discovered some differences in the docs and the actual Connector SDK's package names, going back to at least 8.3. This PR fixes the docs

component: connectors

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support.
• This is already available but undocumented and should be released within a week.
• This on a specific schedule and the assignee will coordinate a release with the DevEx team. (apply hold label or convert to draft PR)
• This is part of a scheduled alpha or minor. (apply alpha or minor label)
• There is no urgency with this change and can be released at any time.

PR Checklist

• My changes are for an already released minor and are in /versioned_docs directory.
• My changes are for the next minor and are in /docs directory (aka /next/).

• My changes require an Engineering review, and I've assigned the Engineering DRI or delegate.
• My changes require a technical writer review, but I haven't assigned @camunda/tech-writers as a reviewer.

[akeller]

@itsmestefanjay thanks for your PR! I followed up internally to get this reviewed and merged.

[sbuettner]

Looking at the actual code I am wondering whether this constructor is even supported anymore beside testing purposes.

As the execution requires more dependencies to be in place beside the validation provider, see https://github.com/camunda/connectors-bundle/blob/9e427e9cc83f21a8f0b576b37ef36c21faa5fcdc/connector-runtime/connector-runtime-core/src/main/java/io/camunda/connector/runtime/core/outbound/ConnectorJobHandler.java#L188

cc @chillleader wdyt?

[akeller]

@sbuettner @chillleader please follow up and open a new PR if action is required here.