chore: rename .github/CODEOWNER to .github/CODEOWNERS

[Jorgagu]

Fix typo in file name for GitHub CODEOWNERS support.

Related Issue or Design Document

Address ory/meta#239

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 approval (please contact security@ory.sh) 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 the necessary documentation within the code base (if appropriate).

Further comments

[Jorgagu]

@vinckr could you please review ?

[vinckr]

thanks so much Jordan!