chore: rename extension after name change

The GitHub Pull Request menu item has been consolidated with GitHub Issues and is now called GitHub instead

Author: rjaegers

test/cpp/features/steps/fixtures.ts

@@ -13,7 +13,7 @@ export const test = base.extend<{ codespacePage: CodespacePage }, { authenticati
     codespacePage: async ({ page }, use) => {
         const codespacePage = new CodespacePage(page);
         await codespacePage.goto();
-        await codespacePage.areExtensionsActive(['SonarQube', 'CMake', 'Live Share', 'GitHub Pull Requests']);
+        await codespacePage.areExtensionsActive(['SonarQube', 'CMake', 'Live Share', 'GitHub']);
 
         await use(codespacePage);