RFR: Updated Code Owners for JDK 20 [v4]

[Sean Mullan]

On Wed, 24 May 2023 15:56:41 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> This should be done after each release to make sure the list is kept up to date.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Misplaced utils

Marked as reviewed by mullan (no project role).

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PR Review: https://git.openjdk.org/guide/pull/103#pullrequestreview-1446287926