fix: dont log channel url in error message

[rdmulford]

Description

resolves #115

Motivation and Context

I saw a slack token url secret being logged in CI after a task failed, so wanted to make sure we aren't logging secrets.

How Has This Been Tested?

minor change in logging

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Chore (updating repository quality of life, like deps, linting, etc.)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.