fix: patch does not work if previous comments

[mathild3r]

• [ x ] Tests written and linted ℹ︎
• [ ] Documentation written ℹ︎
• [ x ] Commit history is tidy ℹ︎

What this does

Explain why this PR exists

If some other comments where present before snyk_prevent_commit_status runs it was trying to do a patch instead of a post.

Notes for the reviewer

Instructions on how to run this locally, background context, what to review, questions…

More information

• Link to documentation

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[aarlaud]

:tada: This PR is included in version 2.0.4 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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