Update TEST_MAPPING

Test: atest
Change-Id: If2aa1200393da45ea195a2f746000584dcbd0e13
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 161921c..5f5ced7 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -8,6 +8,9 @@
       "path": "external/rust/crates/crossbeam-deque"
     },
     {
+      "path": "external/rust/crates/hashbrown"
+    },
+    {
       "path": "external/rust/crates/tinytemplate"
     },
     {