feat: change padding on welcome banner (COR-4248) (#479)

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**Fixes or implements VF-XXX**

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### Related PRs

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- https://github.com/voiceflow/XXXXXXXXX/pull/123

### Checklist

- [ ] Breaking changes have been communicated, including:
    - New required environment variables
    - Renaming of interfaces (API routes, request/response interface, etc)
- [ ] New environment variables have [been deployed](https://www.notion.so/voiceflow/Add-Environment-Variables-be1b0136479f45f1adece7995a7adbfb)
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    - Bug fixes are accompanied by an updated or new test
    - New features are accompanied by a new test

packages/chat/src/components/WelcomeMessage/WelcomeMessage.css.ts

@@ -51,7 +51,7 @@ export const avatarContainer = style({
 });
 
 export const welcomeMessageTitle = style({
-  marginBottom: '2px',
+  marginBottom: '3px',
   fontSize: '22px',
   fontWeight: 700,
   color: COLORS.NEUTRAL_DARK[900],