Update Auto model list to include Sonnet 4.5 rather than Sonnet 4 (#57942)

Author: nhu-do

content/copilot/concepts/auto-model-selection.md

@@ -17,7 +17,7 @@ contentType: concepts
 
 Experience less rate limiting and reduce the mental load of choosing a model by letting {% data variables.copilot.copilot_auto_model_selection %} automatically choose the best available model.  
 
-In {% data variables.product.prodname_vscode_shortname %}, {% data variables.copilot.copilot_auto_model_selection %} chooses from {% data variables.copilot.copilot_gpt_41 %}, {% data variables.copilot.copilot_gpt_5_mini %}, {% data variables.copilot.copilot_gpt_5 %}, {% data variables.copilot.copilot_claude_sonnet_35 %}, and {% data variables.copilot.copilot_claude_sonnet_40 %}, based on availability and to help reduce rate limiting. Included models may change over time.
+In {% data variables.product.prodname_vscode_shortname %}, {% data variables.copilot.copilot_auto_model_selection %} chooses from {% data variables.copilot.copilot_gpt_41 %}, {% data variables.copilot.copilot_gpt_5_mini %}, {% data variables.copilot.copilot_gpt_5 %}, {% data variables.copilot.copilot_claude_sonnet_35 %}, and {% data variables.copilot.copilot_claude_sonnet_45 %}, based on availability and to help reduce rate limiting. Included models may change over time.
 
 Automatically selected models **won't** include these models:
 * Models with premium request multipliers greater than one. See [AUTOTITLE](/copilot/reference/ai-models/supported-models#model-multipliers).