Bump package:usage version

New commits:

```
> git log --format="%C(auto) %h %s" 6c64d9e7b6b3758d06d030efcb5afe20bfc04dde..HEAD
 5b7317b Force close the http-client on IOAnalytics.close() (#155)
 21e6d3c publishing a null safe stable release (#153)
```

Bug: #45235
Change-Id: I47d6119cdeb8210db2207a9247a5f38e0c1841dd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/192686
Reviewed-by: Jonas Jensen <jonasfj@google.com>
Reviewed-by: Devon Carew <devoncarew@google.com>
Commit-Queue: Sigurd Meldgaard <sigurdm@google.com>

Author: sigurdm

DEPS

@@ -162,7 +162,7 @@ vars = {
   "test_reflective_loader_rev": "54e930a11c372683792e22bddad79197728c91ce",
   "test_rev": "e673623f45d75ccec750d35271b0b4d1423e9fac",
   "typed_data_tag": "f94fc57b8e8c0e4fe4ff6cfd8290b94af52d3719",
-  "usage_rev": "6c64d9e7b6b3758d06d030efcb5afe20bfc04dde",
+  "usage_rev": "5b7317ba89166f3cf1af98cb280a4cc8e78f25f9",
   "vector_math_rev": "0c9f5d68c047813a6dcdeb88ba7a42daddf25025",
   "watcher_rev": "3924194385fb215cef483193ed2879a618a3d69c",
   "webdriver_rev": "ff5ccb1522edf4bed578ead4d65e0cbc1f2c4f02",