Bump robolectric from 4.8 to 4.8.1 (#3707)

Summary:
Bumps [robolectric](https://github.com/robolectric/robolectric) from 4.8 to 4.8.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/robolectric/robolectric/releases">robolectric's releases</a>.</em></p>
<blockquote>
<h2>Robolectric 4.8.1</h2>
<p>This is a minor release that fixes <a href="https://github-redirect.dependabot.com/robolectric/robolectric/issues/7286">#7286</a>, a NoClassDefError that can occur. Thanks for <a href="https://github.com/utzcoz"><code>@​utzcoz</code></a> for the fix (<a href="https://github-redirect.dependabot.com/robolectric/robolectric/issues/7284">#7284</a>).</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="8f232f53f7"><code>8f232f5</code></a> Bump version to 4.8.1.</li>
<li><a href="99ae863371"><code>99ae863</code></a> Skip to generate shadowOf for ShadowBackdropFrameRenderer</li>
<li>See full diff in <a href="https://github.com/robolectric/robolectric/compare/robolectric-4.8...robolectric-4.8.1">compare view</a></li>
</ul>
</details>
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</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/3707

Reviewed By: timur-valiev

Differential Revision: D36371191

Pulled By: mweststrate

fbshipit-source-id: 7628698cdfc37152d3a1e20613c0ff360f2ca30a

build.gradle

@@ -92,7 +92,7 @@ ext.deps = [
         lithoTesting       : "com.facebook.litho:litho-testing:$LITHO_VERSION",
         // Debugging and testing
         guava              : 'com.google.guava:guava:23.0',
-        robolectric        : 'org.robolectric:robolectric:4.8',
+        robolectric        : 'org.robolectric:robolectric:4.8.1',
         junit              : 'junit:junit:4.13.2',
         hamcrest           : 'org.hamcrest:hamcrest-library:2.2',
         mockito            : 'org.mockito:mockito-core:4.5.1',