chore(codeowners): add Omar Bravo (#374)

Adding @ojbravo to the CODEOWNERS file for the DSR. 🥳

## Changes

- adds Omar Bravo to the CODEOWNERS file

## How to test this PR

1. Is Omar added to future PRs automatically?
![Screenshot 2024-06-28 at 4 26 42
AM](https://github.com/cfpb/design-system-react/assets/19983248/ea7bf410-35ef-42a5-b459-05e574f7b348)

.github/CODEOWNERS

@@ -1 +1 @@
-* @meissadia @shindigira @billhimmelsbach
+* @meissadia @shindigira @billhimmelsbach @ojbravo