Bump grinder from 0.9.3 to 0.9.4 (#970)

Bumps [grinder](https://github.com/google/grinder.dart) from 0.9.3 to
0.9.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/google/grinder.dart/releases">grinder's
releases</a>.</em></p>
<blockquote>
<h2>v0.9.4</h2>
<ul>
<li>Update the SDK constraint to <code>&gt;=2.17.0
&lt;4.0.0</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/google/grinder.dart/blob/master/CHANGELOG.md">grinder's
changelog</a>.</em></p>
<blockquote>
<h2>0.9.4</h2>
<ul>
<li>Update the SDK constraint to <code>&gt;=2.17.0
&lt;4.0.0</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/google/grinder.dart/commit/f8e38adda571332e7d0370d292df6f6539f197d7"><code>f8e38ad</code></a>
Update the SDK constraint to <code>&gt;=2.17.0 &lt;4.0.0</code> (<a
href="https://github.com/google/grinder.dart/issues/398">#398</a>)</li>
<li>See full diff in <a
href="https://github.com/google/grinder.dart/compare/v0.9.3...v0.9.4">compare
view</a></li>
</ul>
</details>
<br />


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</details>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

pubspec.lock

@@ -77,10 +77,10 @@ packages:
     dependency: transitive
     description:
       name: cli_util
-      sha256: "66f86e916d285c1a93d3b79587d94bd71984a66aac4ff74e524cfa7877f1395c"
+      sha256: b8db3080e59b2503ca9e7922c3df2072cf13992354d5e944074ffa836fba43b7
       url: "https://pub.dev"
     source: hosted
-    version: "0.3.5"
+    version: "0.4.0"
   clock:
     dependency: transitive
     description:
@@ -355,10 +355,10 @@ packages:
     dependency: "direct dev"
     description:
       name: grinder
-      sha256: "1dabcd70f0d3975f9143d0cebf48a09cf56d4f5e0922f1d1931781e1047c8d00"
+      sha256: "48495acdb3df702c55c952c6536faf11631b8401a292eb0d182ef332fc568b56"
       url: "https://pub.dev"
     source: hosted
-    version: "0.9.3"
+    version: "0.9.4"
   http:
     dependency: transitive
     description: