Upgrade rust/crates/itertools to 0.10.1

Test: make
Change-Id: Iebba7d7b3ef9be793890115e01a696300db2dfbb
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..19817ee
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,11 @@
+// Generated by update_crate_tests.py for tests that depend on this crate.
+{
+  "presubmit": [
+    {
+      "name": "unicode-xid_device_test_src_lib"
+    },
+    {
+      "name": "unicode-xid_device_test_tests_exhaustive_tests"
+    }
+  ]
+}