Update Go version requirement in mcpcurl to 1.24

Author: alexandear

cmd/mcpcurl/README.md

@@ -16,7 +16,7 @@ be executed against the configured MCP server.
 ## Installation
 
 ### Prerequisites
-- Go 1.21 or later
+- Go 1.24 or later
 - Access to the GitHub MCP Server from either Docker or local build
 
 ### Build from Source