fix: Add fallback import for langchain_classic

Added try/except block to gracefully fall back to langchain.output_parsers
if langchain_classic is not available. This ensures compatibility across
different deployment environments.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 2 people

scrapegraphai/nodes/generate_code_node.py

@@ -12,10 +12,13 @@
 from bs4 import BeautifulSoup
 from jsonschema import ValidationError as JSONSchemaValidationError
 from jsonschema import validate
-from langchain_classic.output_parsers.structured import (
-    ResponseSchema,
-    StructuredOutputParser,
-)
+try:
+    from langchain_classic.output_parsers.structured import (
+        ResponseSchema,
+        StructuredOutputParser,
+    )
+except ImportError:  # fallback for environments without langchain_classic
+    from langchain.output_parsers import ResponseSchema, StructuredOutputParser
 from langchain_core.prompts import PromptTemplate
 from langchain_community.chat_models import ChatOllama
 from langchain_core.output_parsers import StrOutputParser