Update librdkafka to v2.12.1 (#8541)

Author: waruqi

packages/l/librdkafka/xmake.lua

@@ -5,6 +5,7 @@ package("librdkafka")
 
     add_urls("https://github.com/confluentinc/librdkafka/archive/refs/tags/$(version).tar.gz",
              "https://github.com/confluentinc/librdkafka.git")
+    add_versions("v2.12.1", "ec103fa05cb0f251e375f6ea0b6112cfc9d0acd977dc5b69fdc54242ba38a16f")
     add_versions("v2.11.1", "a2c87186b081e2705bb7d5338d5a01bc88d43273619b372ccb7bb0d264d0ca9f")
     add_versions("v1.6.2", "b9be26c632265a7db2fdd5ab439f2583d14be08ab44dc2e33138323af60c39db")
     add_versions("v1.8.2-POST2", "d556d07cb88ea689e28c8e058ec3265ab333c9fc5e8f4ac0b7509bb5ae0e9f25")