[Web Tracking Protections] Increase font size for web tracking protection (#6783)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1211327330905113?focus=true

### Description
Increases font size for web tracking protection card.

### Steps to test this PR
_QA optional_
- [x] Go to Settings -> Web Tracking Protection
- [x] Verify you see the grid of cards with new font sizes

### UI changes
| Before  | After |
| ------ | ----- |
| <img width="1280" height="2856" alt="Screenshot_20250902_112549"
src="https://github.com/user-attachments/assets/bf407715-397b-4be7-b057-695602ef2721"
/> | <img width="1280" height="2856" alt="Screenshot_20250911_142246"
src="https://github.com/user-attachments/assets/a7857bdc-e470-4cd6-9cfc-080c90bb3656"
/> |

Author: landomen

app/src/main/res/layout/item_feature_grid.xml

@@ -47,7 +47,7 @@
             android:layout_height="wrap_content"
             android:layout_marginHorizontal="@dimen/keyline_1"
             android:layout_marginTop="@dimen/keyline_2"
-            app:typography="h5"
+            app:typography="h4"
             tools:text="@string/webTrackingProtectionThirdPartyTrackersTitle" />
 
         <com.duckduckgo.common.ui.view.text.DaxTextView
@@ -58,7 +58,7 @@
             android:layout_marginTop="@dimen/keyline_1"
             android:layout_marginBottom="@dimen/keyline_2"
             app:textType="secondary"
-            app:typography="caption"
+            app:typography="body2"
             tools:text="@string/webTrackingProtectionThirdPartyTrackersDescription" />
 
     </LinearLayout>