Update xmake.lua (#6537)

packages/d/duckdb/xmake.lua

@@ -5,6 +5,7 @@ package("duckdb")
 
     add_urls("https://github.com/duckdb/duckdb/releases/download/$(version)/libduckdb-src.zip",
              "https://github.com/duckdb/duckdb.git")
+    add_versions("v1.2.1", "c7f21c12039e951dbb74e064ba218a4ca8b4b0a612d40c62d95a858ecaf2fb53")
     add_versions("v1.1.3", "66beec9f299c56f508fec3d647faa86a596d39b2d4e26bd6991b29d07b818f83")
     add_versions("v1.1.2", "8b30ec65addfe423fc18f8403bd958953d01a3193ec8b3bc2e43073433d94e47")
     add_versions("v1.1.1", "48f1ca566ae0f73fb536aec22d599917f47c26ea7ae300380e7ae3f39e29af4d")