bump to linter 0.1.71


* new lint: `prefer_int_literals`
* update `await_only_futures` to allow awaiting on `null`
* update `use_setters_to_change_properties` to work with `=>` short-hand

Change-Id: Iafc46bb9c02675b47bda9b4d4124a8efc76584d8
Reviewed-on: https://dart-review.googlesource.com/c/81881
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Dan Rubel <danrubel@google.com>
Commit-Queue: Phil Quitslund <pquitslund@google.com>
diff --git a/DEPS b/DEPS
index 3ded0c6..5323847 100644
--- a/DEPS
+++ b/DEPS
@@ -95,7 +95,7 @@
   "intl_tag": "0.15.7",
   "jinja2_rev": "2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "2.0.9",
-  "linter_tag": "0.1.70",
+  "linter_tag": "0.1.71",
   "logging_tag": "0.11.3+2",
   "markdown_tag": "2.0.2",
   "matcher_tag": "0.12.3",