Support dict[...] syntax in ApiClient.__deserialize

[mohsinm-dev]

Summary

• Adds support for modern dict[str, str] syntax in ApiClient.__deserialize()
• Maintains backward compatibility with existing dict(str, str) syntax
• Enables Pydantic adapter compatibility for openapi_types

Changes

• Added post-generation patch scripts/api_client_dict_syntax.diff
• Updated scripts/update-client.sh to apply patch during client generation
• Added comprehensive unit tests covering both syntaxes and nested dicts

Test plan

• [x] Unit test test_deserialize_dict_syntax_compatibility passes
• [x] Legacy dict(str, str) syntax continues to work
• [x] New dict[str, str] syntax works correctly
• [x] Nested dict[str, dict[str, str]] syntax works
• [x] No breaking changes to existing functionality

Fixes #2463

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• 1a3a022 client: accept dict[...] in ApiClient.__deserialize (keep dict(...) support)

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