fix: claude-3-5-sonnet-20240620 max token error (#6843)

api/core/model_runtime/model_providers/anthropic/llm/claude-3-5-sonnet-20240620.yaml

     required: false
   - name: max_tokens
     use_template: max_tokens
-    required: true
     default: 8192
     min: 1
     max: 8192

api/core/model_runtime/model_providers/anthropic/llm/llm.py

         # Add the new header for claude-3-5-sonnet-20240620 model
         extra_headers = {}
         if model == "claude-3-5-sonnet-20240620":
-            extra_headers["anthropic-beta"] = "max-tokens-3-5-sonnet-2024-07-15"
+            if model_parameters.get('max_tokens') > 4096:
+                extra_headers["anthropic-beta"] = "max-tokens-3-5-sonnet-2024-07-15"
 
         if tools:
             extra_model_kwargs['tools'] = [