[TEST] Added skipping the `headers` feature to the Bulk REST YAML test

This test has been failing in th Ruby runner, since it assumed the `headers` feature,
but was not annotated accordingly.

This patch adds the `skip` clause with the `headers` feature.

Closes #26896

rest-api-spec/src/main/resources/rest-api-spec/test/bulk/10_basic.yml

@@ -65,6 +65,7 @@
   - skip:
       version: " - 5.4.99"
       reason: confusing exception messaged caused by empty object fixed in 5.5.0
+      features: ["headers"]
 
   - do:
       catch: /Malformed action\/metadata line \[3\], expected FIELD_NAME but found \[END_OBJECT\]/