chore: remove unused import

Author: LucaButBoring

mcp/src/main/java/io/modelcontextprotocol/spec/McpSchema.java

@@ -18,7 +18,6 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.modelcontextprotocol.util.Assert;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;