[chore] Add missing approver to auto_assign (open-telemetry#40010)

#### Description
This was missed in
open-telemetry#39814,
updated list matches [approver and maintainer
list](https://github.com/open-telemetry/opentelemetry-collector-contrib?tab=readme-ov-file#contributing).

Author: crobert-1

.github/auto_assign.yml

@@ -12,6 +12,7 @@ assigneeGroups:
   approvers_maintainers:
     # Approvers
     - ArthurSens
+    - braydonk
     - ChrsMark
     - crobert-1
     # - dashpole on leave