Update dart-lang/tools revision

To pick up the fixes for dart-lang/tools#252

Change-Id: Ib0d5b8810d8c785df1e3990f3428df8dc4834297
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/358220
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Zach Anderson <zra@google.com>

DEPS

@@ -185,7 +185,7 @@ vars = {
   "test_descriptor_rev": "35f97afacb2b7fe627f6ed0bede722fd48980848",
   "test_process_rev": "7fe39afbb6c444f256c1ec0eef008edebcd44644",
   "test_reflective_loader_rev": "9862703a3d14848376c8efde271c88022fba91eb",
-  "tools_rev": "378790dd8cdaecd8cb48283de445f7cf80419cc0",
+  "tools_rev": "f611290b530123ee2f0a3fda7c440d85dd080a30",
   "typed_data_rev": "375efaa02a13dad0785cfbd9bdcb9f09aa8ef529",
   "usage_rev": "67ecd7d1328347ec15cbf8d8a46918df75a66af8",
   "vector_math_rev": "7e705f734e94917e9a5347578e6e496f8db38ac6",