PYTHON-5673 Only update sbom when core dependencies change

[blink1073]

PYTHON-5673

Changes in this PR

Prevent pyproject.toml changes from triggering an SBOM update PR, since there are no direct dependencies defined in pyproject.toml. We are covered by the requirements.txt file. This prevents spurious PRs like #2645.

Test Plan

N/A

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[aclark4life]

Does that mean we can remove pyproject.toml over here (assuming we leave dependencies in requirements.txt) ?

[blink1073]

Does that mean we can remove pyproject.toml mongodb/django-mongodb-backend#451 (comment) we leave dependencies in requirements.txt) ?

I'd say yes, since the backend uses the same pattern. Otherwise you'd get a PR for updating a lint rule.

[aclark4life]

LGTM!