Add support PHPUnit 10

[kenjis]

Description CI 4.5.0 requires PHPUnit 10.

Checklist:

• [x] Securely signed commits
• [ ] Component(s) with PHPDoc blocks, only if necessary or adds value
• [ ] Unit testing, with >80% coverage
• [ ] User guide updated
• [ ] Conforms to style guide

[kenjis]

Can someone review?

[michalsn]

Doh... this is a devkit repo. All good.