[BUG]: Fix CODEOWNERS file

[SebastianSchmidl]

Reference Issues/PRs

None, maybe #1095

What does this implement/fix? Explain your changes.

• removes @ermshaua, not a core dev
• fixes name of code of conduct team

Does your contribution introduce a new dependency? If yes, which one?

Nope

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[SebastianSchmidl]

It is unclear to me why GitHub still complains about @aeon-toolkit/aeon-code-of-conduct-workgroup It does exist: https://github.com/orgs/aeon-toolkit/teams/aeon-code-of-conduct-workgroup

[MatthewMiddlehurst]

LGTM, CoCC issue was that the group did not have write access. I have changed the group permissions.