deps: 例子也要跟着这条线

例子仍用版本号依赖 openkal,而仓库本身改成了 git 依赖 —— 两种形式不能并存,
CI 报的是 'requested as both a version dep and a git dep'。

一次改依赖形式,要改的是**图里的每一处**,而例子也在图里。

Author: speak-agent

examples/hello/mcpp.toml

@@ -13,5 +13,5 @@ runner  = ["qemu-system-riscv64", "-machine", "virt", "-nographic",
            "-no-reboot", "-bios", "default", "-kernel"]
 
 [dependencies]
-openkal         = "0.5.1"
+openkal         = { git = "https://github.com/mcpplibs/openkal", branch = "feat/openkal-closure" }
 openkal-opensbi = { path = "../.." }