explicitly make env var dict items strings

13_sandboxes/codelangchain/agent.py

@@ -2,7 +2,7 @@
 # cmd: ["modal", "run", "13_sandboxes.codelangchain.agent", "--question", "Use gpt2 and transformers to generate text"]
 # tags: ["featured", "use-case-sandboxed-code-execution"]
 # pytest: false
-# env: {MODAL_AUTOMOUNT: True}
+# env: {"MODAL_AUTOMOUNT": "True"}
 # ---
 
 # # Build a coding agent with Modal Sandboxes and LangGraph