update deprecation dates

Author: msakande

articles/ai-studio/concepts/model-lifecycle-and-retirement.md

@@ -67,7 +67,7 @@ Models labeled _Retired_ are no longer available for use. You can't create new d
 
 | Model provider | Model | Legacy date | Deprecation date | Retirement date | Suggested replacement model |
 | ---- | ---- | ---- | --- | ---- | --- |
-| Mistral AI | [Mistral-large](https://aka.ms/azureai/landing/Mistral-Large) | December 1, 2024 | January 1, 2025 | March 31, 2025 | [Mistral-large-2407](https://aka.ms/azureai/landing/Mistral-Large-2407) |
+| Mistral AI | [Mistral-large](https://aka.ms/azureai/landing/Mistral-Large) | December 15, 2024 | January 15, 2025 | April 15, 2025 | [Mistral-large-2407](https://aka.ms/azureai/landing/Mistral-Large-2407) |
 
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articles/machine-learning/concept-model-lifecycle-and-retirement.md

@@ -67,7 +67,7 @@ Models labeled _Retired_ are no longer available for use. You can't create new d
 
 | Model provider | Model | Legacy date | Deprecation date | Retirement date | Suggested replacement model |
 | ---- | ---- | ---- | --- | ---- | --- |
-| Mistral AI | [Mistral-large](https://aka.ms/azureai/landing/Mistral-Large) | December 1, 2024 | January 1, 2025 | March 31, 2025 | [Mistral-large-2407](https://aka.ms/azureai/landing/Mistral-Large-2407) |
+| Mistral AI | [Mistral-large](https://aka.ms/azureai/landing/Mistral-Large) | December 15, 2024 | January 15, 2025 | April 15, 2025 | [Mistral-large-2407](https://aka.ms/azureai/landing/Mistral-Large-2407) |
 
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