[deps] rev package:string_scanner

Change-Id: I5512c7cab3a355ab9ef223f10ab7de059edf7263
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243708
Reviewed-by: Nate Bosch <nbosch@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>
diff --git a/DEPS b/DEPS
index 54749aa..3c7752c 100644
--- a/DEPS
+++ b/DEPS
@@ -153,7 +153,7 @@
   "sse_rev": "9a54f1cdd91c8d79a6bf5ef8e849a12756607453",
   "stack_trace_rev": "5220580872625ddee41e9ca9a5f3364789b2f0f6",
   "stream_channel_rev": "3fa3e40c75c210d617b8b943b9b8f580e9866a89",
-  "string_scanner_rev": "0e53bf9059e8e22a3b346aac7ec755a0f8314eb6",
+  "string_scanner_rev": "6579871b528036767b3200b390a3ecef28e4900d",
   "sync_http_rev": "b59c134f2e34d12acac110d4f17f83e5a7db4330",
   "term_glyph_rev": "4885b7f8af6931e23d3aa6d1767ee3f9a626923d",
   "test_descriptor_rev": "ead23c1e7df079ac0f6457a35f7a71432892e527",