chore: Update selector for Wikipedia search button

This commit changes the selector for the search button on the Wikipedia page. An adjustment was made to directly select the child button in the search form, improving selection accuracy and preventing potential errors.

src/test/groovy/dev/schulte/spockgebdemo/wikipedia/WikipediaPage.groovy

@@ -12,9 +12,9 @@ class WikipediaPage extends Page {
 
   static content = {
     searchField { $("#searchInput") }
-    searchButton(to: WikipediaResultsPage) { $("#searchform button") }
+    searchButton(to: WikipediaResultsPage) { $("#searchform > button") }
   }
-  
+
   void search(String searchTerm) {
     searchField.value searchTerm
     searchButton.click()