catalog-backend: update PlaceholderProcessor test to work with Jest 27

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/catalog-backend/src/modules/core/PlaceholderProcessor.test.ts

@@ -345,7 +345,7 @@ describe('PlaceholderProcessor', () => {
         },
       ),
     ).rejects.toThrow(
-      'Placeholder $text could not form a URL out of ./a/b/catalog-info.yaml and ../c/catalog-info.yaml, TypeError: Invalid base URL: ./a/b/catalog-info.yaml',
+      /^Placeholder \$text could not form a URL out of \.\/a\/b\/catalog-info\.yaml and \.\.\/c\/catalog-info\.yaml, TypeError \[ERR_INVALID_URL\]/,
     );
 
     expect(read).not.toBeCalled();