Fix sse_core.clj to use the updated API in the MCP Java SDK

Version 0.17.2 of the MCP Java SDK has changed its API to instanciate
HttpServletSseServerTransportProvider. This commit addresses the
resulting failure when starting clj -X:mcp-sse.

Author: robewald

src/clojure_mcp/sse_core.clj

@@ -23,7 +23,9 @@
 (defn mcp-sse-server []
   (log/info "Starting SSE MCP server")
   (try
-    (let [transport-provider (HttpServletSseServerTransportProvider. (ObjectMapper.) "/mcp/message")
+    (let [transport-provider (-> (HttpServletSseServerTransportProvider/builder)
+                                 (.messageEndpoint "/mcp/message")
+                                 (.build))
           server (-> (McpServer/async transport-provider)
                      (.serverInfo "clojure-server" "0.1.0")
                      (.capabilities (-> (McpSchema$ServerCapabilities/builder)