Add groups for babel and rnx-kit (#3144)

.github/dependabot.yml

@@ -2,6 +2,19 @@ version: 2
 updates:
   - package-ecosystem: npm
     directory: '/'
+    groups:
+      babel:
+        patterns:
+          - '@babel*'
+        update-types:
+          - 'minor'
+          - 'patch'
+      rnx-kit:
+        patterns:
+          - '@rnx-kit*'
+        update-types:
+          - 'minor'
+          - 'patch'
     schedule:
       interval: daily
       time: '13:00'