Retire phillebaba as core maintainer.

[swade1987]

Description

Philip messaged us in November 2023 that he wants to step down as core maintainer. Thanks @phillebaba, for all the great work you've done in Flux over the years 🤗

Motivation and Context

Ref https://github.com/fluxcd/community/pull/374

How has this been tested?

N/A

Types of changes

N/A

Documentation

N/A

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [x] I have signed-off my commits with git commit -s

Community Note

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