Make a dedicated webkit renovate group (#6860)

Author: TimoPtr

renovate.json5

@@ -100,9 +100,16 @@
                 '!androidx.compose{/,}**',
                 '!androidx.navigation:navigation-compose{/,}**',
                 '!androidx.wear.compose{/,}**',
+                '!androidx.webkit{/,}**',
                 'androidx.{/,}**',
             ],
         },
+        {
+            groupName: 'androidx.webkit:*',
+            matchPackageNames: [
+                'androidx.webkit:{/,}**',
+            ],
+        },
         {
             groupName: 'com.android.*',
             matchPackageNames: [