Humaneval - fix regression (#3102)

* use double quotes

Author: baberabb

lm_eval/tasks/humaneval/humaneval_instruct.yaml

@@ -1,7 +1,7 @@
 include: humaneval.yaml
 task: humaneval_instruct
-doc_to_text: 'Write a solution to the following problem and make sure that it passes the tests:\n```python\n{{ prompt }}\n```\n '
-gen_prefix: 'Here is the completed function:\n```python\n{{ prompt }}\n '
+doc_to_text: "Write a solution to the following problem and make sure that it passes the tests:\n```python\n{{ prompt }}\n```\n "
+gen_prefix: "Here is the completed function:\n```python\n{{ prompt }}\n "
 filter_list:
   - name: "create_test"
     filter: