chore: update code owners (backport #444)

[mergify]

• add Sajin to code owners
• allow github actions bot to raise prs on release branches (for weekly releases)

  ---

  This is an automatic backport of pull request chore: update code owners #444 done by Mergify.

[mergify]

Cherry-pick of d23da9e has failed:

On branch mergify/bp/version-14-hotfix/pr-444
Your branch is up to date with 'origin/version-14-hotfix'.

You are currently cherry-picking commit d23da9e.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/CODEOWNERS

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .mergify.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally