Bump cli_util to 71ba36e2554f7b7717f3f12b5ddd33751a4e3ddd

Changes:
```
> git log --format="%C(auto) %h %s" c2dc871..71ba36e
 https://dart.googlesource.com/cli_util.git/+/71ba36e Make applicationConfigHome failures catchable (#68)
 https://dart.googlesource.com/cli_util.git/+/6872f39 Improve tests for applicationConfigHome (#67)

```

Diff: https://dart.googlesource.com/cli_util.git/+/c2dc871784b59720e6cf5794dee1a20735df3feb~..71ba36e2554f7b7717f3f12b5ddd33751a4e3ddd/
Change-Id: Ia9705eb0d323d08a3ab201a3677c5cea81f8dbd4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/216183
Reviewed-by: Jonas Jensen <jonasfj@google.com>
Commit-Queue: Sigurd Meldgaard <sigurdm@google.com>

DEPS

@@ -85,7 +85,7 @@ vars = {
   "characters_rev": "6ec389c4dfa8fce14820dc5cbf6e693202e7e052",
   "charcode_rev": "84ea427711e24abf3b832923959caa7dd9a8514b",
   "chrome_rev" : "19997",
-  "cli_util_rev" : "c2dc871784b59720e6cf5794dee1a20735df3feb",
+  "cli_util_rev" : "71ba36e2554f7b7717f3f12b5ddd33751a4e3ddd",
   "clock_rev" : "a494269254ba978e7ef8f192c5f7fec3fc05b9d3",
   "collection_rev": "a4c941ab94044d118b2086a3f261c30377604127",
   "convert_rev": "e063fdca4bebffecbb5e6aa5525995120982d9ce",