chore: bump mcp-hub version handling stale lock files (fixes #234)

Author: ravitemer

lua/mcphub/utils/version.lua

@@ -3,7 +3,7 @@ return {
     REQUIRED_NODE_VERSION = { -- Required mcp-hub version
         major = 4,
         minor = 2,
-        patch = 0,
-        string = "4.2.0",
+        patch = 1,
+        string = "4.2.1",
     },
 }