Bump vector_math to 1c72944e8c2f02340a1d90b32aab2e3836cef8cc

Changes:
```
> git log --format="%C(auto) %h %s" 0cbed09..1c72944
 https://dart.googlesource.com/external/github.com/google/vector_math.dart.git/+/1c72944 CI: Remove explicit --packages arg to coverage (#263)
 https://dart.googlesource.com/external/github.com/google/vector_math.dart.git/+/9c2e6d3 Fix usage of pub (#258)

```

Diff: https://dart.googlesource.com/external/github.com/google/vector_math.dart.git/+/0cbed0914d49a6a44555e6d5444c438a4a4c3fc1~..1c72944e8c2f02340a1d90b32aab2e3836cef8cc/
Change-Id: I8ade6b88cb2d8112be38367a917af82f12335370
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/246724
Commit-Queue: Devon Carew <devoncarew@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>

DEPS

@@ -155,7 +155,7 @@ vars = {
   "test_rev": "d54846bc2b5cfa4e1445fda85c5e48a00940aa68",
   "typed_data_rev": "8b19e29bcf4077147de4d67adeabeb48270c65eb",
   "usage_rev": "e85d575d6decb921c57a43b9844bba3607479f56",
-  "vector_math_rev": "0cbed0914d49a6a44555e6d5444c438a4a4c3fc1",
+  "vector_math_rev": "1c72944e8c2f02340a1d90b32aab2e3836cef8cc",
   "watcher_rev": "f76997ab0c857dc5537ac0975a9ada92b54ef949",
   "web_components_rev": "8f57dac273412a7172c8ade6f361b407e2e4ed02",
   "web_socket_channel_rev": "99dbdc5769e19b9eeaf69449a59079153c6a8b1f",