fix(gen): downgrade langchain-google-genai - #129
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mwien
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friedrichwilken
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The SDK's ChatGoogleGenerativeAI shadows the upstream `validate_environment` validator to inject the AI Core client. Since langchain-google-genai 4.3.7 that upstream validator also registers the client with a `_ClientCleanup` object which the `async_client` property and `aclose()` dereference, so every async call failed with AttributeError. Register the injected client in our own `_initialize_client` validator instead, add a unit test covering `async_client` and `aclose()`, lift the `<4.3.7` pin introduced as a stopgap in SAP#122/SAP#129, and update the stale pin in README_sphynx.md. Refs SAP#152
friedrichwilken
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The SDK's ChatGoogleGenerativeAI shadows the upstream `validate_environment` validator to inject the AI Core client. Since langchain-google-genai 4.3.7 that upstream validator also registers the client with a `_ClientCleanup` object which the `async_client` property and `aclose()` dereference, so every async call failed with AttributeError. Register the injected client in a validator of our own on the chat class, add a unit test covering `async_client` and `aclose()`, lift the `<4.3.7` pin introduced as a stopgap in SAP#122/SAP#129, and update the stale pin in README_sphynx.md. Refs SAP#152
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Context
Downgrade langchain-google-genai.
What this PR does and why it is needed
Downgrade langchain-google-genai, as it was auto-updated again. Auto-merge for renovate has been disabled in another PR.