🐛 Source Harvest: fix broken spec file

[tyschroed]

What

Fixes #4221

How

Renames api_key to api_token to align with expected inputs, also updates documentationUrl to point to Harvest source docs.

Recommended reading order

1. spec.json

Pre-merge Checklist

Expand the checklist which is relevant for this PR.

Connector checklist

• Issue acceptance criteria met
• PR name follows PR naming conventions
• Secrets are annotated with airbyte_secret in output spec
• Unit & integration tests added as appropriate (and are passing)
  • Community members: please provide proof of this succeeding locally e.g: screenshot or copy-paste 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.
• /test connector=connectors/<name> command as documented here is passing.
  • Community members can skip this, Airbyters will run this for you.
• Code reviews completed
• Credentials added to Github CI if needed and not already present. instructions for injecting secrets into CI.
• Documentation updated
  • README
  • CHANGELOG.md
  • Reference docs in the docs/integrations/ directory.
  • Build status added to build page
• Build is successful
• Connector version bumped like described here
• New Connector version released on Dockerhub by running the /publish command described here
• No major blockers
• PR merged into master branch
• Follow up tickets have been created
• Associated tickets have been closed & stakeholders notified

Connector Generator checklist

• Issue acceptance criteria met
• PR name follows PR naming conventions
• If adding a new generator, add it to the list of scaffold modules being tested
• The generator test modules (all connectors with -scaffold in their name) have been updated with the latest scaffold by running ./gradlew :airbyte-integrations:connector-templates:generator:testScaffoldTemplates then checking in your changes
• Documentation which references the generator is updated as needed.

[marcosmarxm]

oh! thanks a lot @tyschroed i'm going to test and bump the new version of the connector

[marcosmarxm]

@tyschroed you should be able to upgrade the connector in the admin page to 0.1.2.

[tyschroed]

Thank you!