chore: delete semantic.yml

[kevgo]

Replaced by ory/meta#154

https://github.com/zeke/semantic-pull-requests is no longer maintained.

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got green light (please contact [email protected]) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation within the code base (if appropriate).