Convert string port to int port

[ahuang11]

User reports "Version 0.3.0 creates an invalid dbt profile for postgres. Port value in the target config is set as string which fails dbt cli run. Profile is correct with version 0.2.7."

Closes #131

Example

Screenshots

Checklist

• References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• Includes tests or only affects documentation.
• Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• Includes screenshots of documentation updates.
  • Run mkdocs serve view documentation locally.
• Summarizes PR's changes in CHANGELOG.md

[zzstoatzz]

looks like we're failing a test for DBTCoreOperation?

[ahuang11]

Okay it should be fixed.