Bump guava-gwt from 30.1.1-jre to 31.0.1-jre

Bumps [guava-gwt](https://github.com/google/guava) from 30.1.1-jre to 31.0.1-jre.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/google/guava/releases">guava-gwt's releases</a>.</em></p>
<blockquote>
<h2>31.0.1</h2>
<h3>Maven</h3>
<pre lang="xml"><code>&lt;dependency&gt;
  &lt;groupId&gt;com.google.guava&lt;/groupId&gt;
  &lt;artifactId&gt;guava&lt;/artifactId&gt;
  &lt;version&gt;31.0.1-jre&lt;/version&gt;
  &lt;!-- or, for Android: --&gt;
  &lt;version&gt;31.0.1-android&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>
<h3>Jar files</h3>
<ul>
<li><a href="https://repo1.maven.org/maven2/com/google/guava/guava/31.0.1-jre/guava-31.0.1-jre.jar">31.0.1-jre.jar</a></li>
<li><a href="https://repo1.maven.org/maven2/com/google/guava/guava/31.0.1-android/guava-31.0.1-android.jar">31.0.1-android.jar</a></li>
</ul>
<p>Guava requires <a href="https://github.com/google/guava/wiki/UseGuavaInYourBuild#what-about-guavas-own-dependencies">one runtime dependency</a>, which you can download here:</p>
<ul>
<li><a href="https://repo1.maven.org/maven2/com/google/guava/failureaccess/1.0.1/failureaccess-1.0.1.jar">failureaccess-1.0.1.jar</a></li>
</ul>
<h3>Javadoc</h3>
<ul>
<li><a href="http:https://guava.dev/releases/31.0.1-jre/api/docs/">31.0.1-jre</a></li>
<li><a href="http:https://guava.dev/releases/31.0.1-android/api/docs/">31.0.1-android</a></li>
</ul>
<h3>JDiff</h3>
<ul>
<li><a href="http:https://guava.dev/releases/31.0.1-jre/api/diffs/">31.0.1-jre vs. 31.0-jre</a></li>
<li><a href="http:https://guava.dev/releases/31.0.1-android/api/diffs/">31.0.1-android vs. 31.0-android</a></li>
<li><a href="http:https://guava.dev/releases/31.0.1-android/api/androiddiffs/">31.0.1-android vs. 31.0.1-jre</a></li>
</ul>
<h3>Changelog</h3>
<ul>
<li>Fixed <a href="https://groups.google.com/g/guava-discuss/c/I32pgyyj1N8/m/pXcyky2hAgAJ">GWT compilation failure</a> introduced in release 31.0. (0ad6d6d9e1)</li>
</ul>
<h2>31.0</h2>
<h3>Maven</h3>
<pre lang="xml"><code>&lt;dependency&gt;
  &lt;groupId&gt;com.google.guava&lt;/groupId&gt;
  &lt;artifactId&gt;guava&lt;/artifactId&gt;
  &lt;version&gt;31.0-jre&lt;/version&gt;
  &lt;!-- or, for Android: --&gt;
  &lt;version&gt;31.0-android&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/google/guava/commits">compare view</a></li>
</ul>
</details>
<br />

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</details>

Fixes google#917

COPYBARA_INTEGRATE_REVIEW=google#917 from google:dependabot/maven/com.google.guava-guava-gwt-31.0.1-jre e12308c
PiperOrigin-RevId: 399430236

pom.xml

@@ -37,7 +37,7 @@
  time, one gets submitted before the other, and
  the other ends up with a merge conflict. That requires reapprovals.
  -->
- <guava.jre.version>30.1.1-jre</guava.jre.version>
+ <guava.jre.version>31.0.1-jre</guava.jre.version>
  <gwt.version>2.9.0</gwt.version>
  <protobuf.version>3.18.0</protobuf.version>
  <!-- Property for protobuf-lite protocArtifact, which isn't a "normal" Maven dep. -->