Update TEST_MAPPING am: a8324f0d1f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unicode-segmentation/+/2006198

Change-Id: I4d480961e23b3fa589d14ce2e58af0873799607b
diff --git a/TEST_MAPPING b/TEST_MAPPING
index c934591..a0b6beb 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -2,6 +2,9 @@
 {
   "imports": [
     {
+      "path": "external/rust/crates/argh"
+    },
+    {
       "path": "external/rust/crates/base64"
     },
     {