Fix model metadata for findability.

README.md

@@ -2,7 +2,7 @@
 library_name: vllm
 inference: false
 base_model:
-- mistralai/Mistral-Small-3.1-24B-Base-2503
+- mistralai/Devstral-Small-2-24B-Instruct-2512
 extra_gated_description: >-
   If you want to learn more about how we process your personal data, please read
   our <a href="https://mistral.ai/terms/">Privacy Policy</a>.