aider: Color the "gpt-3.5" models green in the plotting code.

# Aider chat conversation:

USER: color the gpt-3.5 models a new color

ASSISTANT: To color the "gpt-3.5" models a new color, we need to modify the plotting code in `benchmark/over_time.py` to check for "gpt-3.5" in the model name and assign a different color.

Here are the changes:

benchmark/over_time.py
```python
<<<<<<< SEARCH
    colors = ['red' if 'gpt-4' in model else 'blue' for model in models]
=======
    colors = ['red' if 'gpt-4' in model else 'green' if 'gpt-3.5' in model else 'blue' for model in models]
>>>>>>> REPLACE
```

benchmark/over_time.py

@@ -17,7 +17,7 @@ def plot_over_time(yaml_file):
             models.append(entry['model'])
 
     plt.figure(figsize=(10, 6))
-    colors = ['red' if 'gpt-4' in model else 'blue' for model in models]
+    colors = ['red' if 'gpt-4' in model else 'green' if 'gpt-3.5' in model else 'blue' for model in models]
     plt.scatter(dates, pass_rates, c=colors, alpha=0.5)
 
     for i, model in enumerate(models):