more stable shards (#6916)

Signed-off-by: Jess Frazelle <github@jessfraz.com>

rust/kcl-lib/src/docs/kcl_doc.rs

@@ -1262,6 +1262,8 @@ mod test {
                     &result,
                     0.99,
                 );
+                // yield to allow other tests to run
+                tokio::task::yield_now().await;
             }
         }