Update lock_api to 0.4.6

Test: cd external/rust/crates && atest --host -c
Change-Id: Ieaac4c489656751a71ea398bb05725212cbb6dc7
diff --git a/Android.bp b/Android.bp
index 06ca975..67d3a3b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -42,7 +42,7 @@
     host_supported: true,
     crate_name: "lock_api",
     cargo_env_compat: true,
-    cargo_pkg_version: "0.4.5",
+    cargo_pkg_version: "0.4.6",
     srcs: ["src/lib.rs"],
     edition: "2018",
     rustlibs: [