🎉 Source Freshdesk: fix spec for backward compatibility

[bazarnov]

What

Resolves: #15377

How

• edited spec.json to support backward compatibility.

🚨 User Impact 🚨

Are there any breaking changes? What is the end result perceived by the user? If yes, please merge this PR with the 🚨🚨 emoji so changelog authors can further highlight this if needed.

Pre-merge Checklist

Expand the relevant checklist and delete the others.

Updating a connector

Community member or Airbyter

• Unit & integration tests added and passing. Community members, please provide proof of success locally e.g: screenshot or copy-paste unit, integration, and acceptance test output. To run acceptance tests for a Python connector, follow instructions in the README. For java connectors run ./gradlew :airbyte-integrations:connectors:<name>:integrationTest.
• Code reviews completed
• Documentation updated
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions

Airbyter

If this is a community PR, the Airbyte engineer reviewing this PR is responsible for the below items.

• Create a non-forked branch based on this PR and test the below items on it
• Build is successful
• If new credentials are required for use in CI, add them to GSM. Instructions.
• /test connector=connectors/<name> command is passing
• New Connector version released on Dockerhub and connector version bumped by running the /publish command described here

[bazarnov]

/publish connector=connectors/source-freshdesk

🕑 Publishing the following connectors:
connectors/source-freshdesk
https://github.com/airbytehq/airbyte/actions/runs/2808491256

Connector	Did it publish?	Were definitions generated?
connectors/source-freshdesk	✅	✅

if you have connectors that successfully published but failed definition generation, follow step 4 here ▶️