Fix release workflow

[mikealfare]

Problem

• audit core team did not specify a job dependency
• audit core team was not passing secrets to the action
• audit version had a typo
• release branch resolution had a syntax error

Solution

• fix all of the above
• run a test release to demonstrate that it's working

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

[mikealfare]

This created a draft release:

• PyPI (test): https://test.pypi.org/project/dbt-postgres/1.8.1/
• GitHub (draft): https://github.com/dbt-labs/dbt-postgres/releases/tag/untagged-2d24b2231e5d7ca227c0

The GitHub draft release will be removed to make room for the real release once this is merged.