Update `CODEOWNERS`

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From @dan437 on Slack 2024-05-03:

Hi, I've been actually working for the last 6+ months mostly on non-swaps things and I'm in the Transaction team now, so hopefully @nikoferro / @infiniteflower who are in the Swaps team can get it done.

Last change of CODEOWNERS.md: #156

swaps-controller/.github/CODEOWNERS

Line 4 in 4f182e9

* @MetaMask/engineering @dan437

The CODOWNERS.md file should be updated with the appropriate team(s) as opposed to individuals.

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Partially addressed in:

• Update CODEOWNERS.md #234

Still needs new team(s) assigned.