Update model-lifecycle-retirement.md

Mistral small -- deprecation info

Author: msakande

articles/ai-foundry/concepts/model-lifecycle-retirement.md

@@ -98,6 +98,7 @@ The following tables list the timelines for models that are on track for retirem
 
 | Model | Legacy date (UTC) | Deprecation date (UTC) | Retirement date (UTC) | Suggested replacement model |
 |-------|-------------------|------------------------|-----------------------|-----------------------------|
+| [Mistral-small](https://ai.azure.com/explore/models/Mistral-small/version/1/registry/azureml-mistral) | March 31, 2025 | April 30, 2025 | July 31, 2025 | [Mistral-small-2503](https://aka.ms/aistudio/landing/mistral-small-2503) |
 | [Mistral-large-2407](https://aka.ms/azureai/landing/Mistral-Large-2407) | January 13, 2025 | February 13, 2025 | May 13, 2025 | [Mistral-large-2411](https://aka.ms/aistudio/landing/Mistral-Large-2411) |
 | [Mistral-large](https://aka.ms/azureai/landing/Mistral-Large) | December 15, 2024 | January 15, 2025 | April 15, 2025 | [Mistral-large-2411](https://aka.ms/aistudio/landing/Mistral-Large-2411) |