Add @balintbrews to CODEOWNERS

… and he writes excellent issue summaries/MR descriptions, like https://git.drupalcode.org/project/experience_builder/-/merge_requests/178.

He got high praise from @bnjmnm at #3468050-20: Values in props edit form do not always match the selected component → 😊

Wim Leers → credited jessebaker → .

Got +1s from @jessebaker and @lauriii already :)

lauriii → credited balintbrews → .

Confirmed with @balintbrews that he's happy to be included in the CODEOWNERS 😊

Automatically closed - issue fixed for 2 weeks with no activity.