Bump gcloud from 0.8.10 to 0.8.11 in /app_dart (#2989)

Bumps [gcloud](https://github.com/dart-lang/gcloud) from 0.8.10 to 0.8.11.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/gcloud/releases">gcloud's releases</a>.</em></p>
<blockquote>
<h2>package:gcloud v0.8.11</h2>
<ul>
<li>After the first <code>Page</code> created by <code>Datastore.withRetry()</code> retries were not
happening. This is now fixed, ensuring that <code>Page.next()</code> will always retry
when <code>Datastore</code> is wrapped with <code>Datastore.withRetry()</code>.</li>
<li>Calling with <code>wait: false</code> in <code>Subscription.pull(wait: false)</code> for <code>PubSub</code>
have been deprecated.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/gcloud/blob/master/CHANGELOG.md">gcloud's changelog</a>.</em></p>
<blockquote>
<h2>0.8.11</h2>
<ul>
<li>After the first <code>Page</code> created by <code>Datastore.withRetry()</code> retries were not
happening. This is now fixed, ensuring that <code>Page.next()</code> will always retry
when <code>Datastore</code> is wrapped with <code>Datastore.withRetry()</code>.</li>
<li>Calling with <code>wait: false</code> in <code>Subscription.pull(wait: false)</code> for <code>PubSub</code>
have been deprecated.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dart-lang/gcloud/commit/2ec9bcbe02669fc9efcece5c7460001478dff68d"><code>2ec9bcb</code></a> Fix missing retries in Page.next (<a href="https://redirect.github.com/dart-lang/gcloud/issues/170">#170</a>)</li>
<li>See full diff in <a href="https://github.com/dart-lang/gcloud/compare/v0.8.10...v0.8.11">compare view</a></li>
</ul>
</details>
<br />

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</details>

app_dart/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
   dbcrypt: 2.0.0
   file: 6.1.4
   fixnum: 1.1.0
-  gcloud: 0.8.10
+  gcloud: 0.8.11
   github: 9.17.0
   googleapis: 11.4.0
   googleapis_auth: 1.4.1