fix: example code should use latest protocol version

Author: Really Him

docs/specification/2025-03-26/basic/lifecycle.mdx

@@ -56,7 +56,7 @@ The client **MUST** initiate this phase by sending an `initialize` request conta
   "id": 1,
   "method": "initialize",
   "params": {
-    "protocolVersion": "2024-11-05",
+    "protocolVersion": "2025-03-26",
     "capabilities": {
       "roots": {
         "listChanged": true
@@ -84,7 +84,7 @@ The server **MUST** respond with its own capabilities and information:
   "jsonrpc": "2.0",
   "id": 1,
   "result": {
-    "protocolVersion": "2024-11-05",
+    "protocolVersion": "2025-03-26",
     "capabilities": {
       "logging": {},
       "prompts": {