fix: decrease collaborator font size (#7754)

Decreases the collaborator font size to make it less eye-catching.

Before:

![image](https://github.com/user-attachments/assets/9a55d7fc-13eb-4656-aead-ca9e25100a63)

After:

![image](https://github.com/user-attachments/assets/3b1e0f26-9fa7-4ae2-ad2c-dc68839c8197)

frontend/src/component/feature/FeatureView/Collaborators.tsx

@@ -64,6 +64,7 @@ const Container = styled('article')(({ theme }) => ({
     [theme.breakpoints.down('xl')]: {
         display: 'none',
     },
+    fontSize: theme.typography.body2.fontSize,
     flex: 1,
 }));