Spring AI [BUG] McpSyncClientCustomizer sampling method has concurrency safety issues with shared state

There are concurrency safety issues in the sampling method of McpSyncClientCustomizer. When multiple MCP clients send requests simultaneously, it may lead to model routing errors and exceptions.

running code : https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/sampling

code location: https://github.com/spring-projects/spring-ai-examples/blob/main/model-context-protocol/sampling/mcp-weather-webmvc-server/src/main/java/org/springframework/ai/mcp/sample/server/WeatherService.java

then , client code will lead to model routing errors : code location :