Use protobuf_nowkt as a dependency of the Rust runtime.

IIUC that's what runtimes should depend on.

PiperOrigin-RevId: 572880936

rust/cpp_kernel/BUILD

diff --git a/rust/cpp_kernel/BUILD b/rust/cpp_kernel/BUILD
index 9d9c5bf..245772c 100644
--- a/rust/cpp_kernel/BUILD
+++ b/rust/cpp_kernel/BUILD
@@ -11,7 +11,7 @@
     ],
     deps = [
         ":rust_alloc_for_cpp_api",
-        "//:protobuf",
+        "//:protobuf_nowkt",
     ],
 )