Added the next changelog (#396)

Author: SommerEngineering

app/MindWork AI Studio/wwwroot/changelog/v0.9.40.md

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+# v0.9.40, build 215 (2025-04-xx xx:xx UTC)
+- Added support for the announced OpenAI `o4` models. We hope that these `o4` models will be usable by the well-known chat completion API instead of the new responses API, though. AI Studio cannot use the new responses API right now.
+- Added Alibaba Cloud as a new provider.
+- Improved the provider selection by showing the name of the provider in the provider selection instead of its identifier.
+- Fixed an issue where OpenAI `o3` models were not shown in the model selection.