Bump struts2-core from 2.5.30 to 2.5.31 in /extensions/struts2

Bumps [struts2-core](https://github.com/apache/struts) from 2.5.30 to 2.5.31.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/apache/struts/releases">struts2-core's releases</a>.</em></p>
<blockquote>
<h2>Struts 2.5.31</h2>
<h2>What's Changed</h2>
<ul>
<li><a href="https://github.com/apache/struts/commit/2d6f1bc0a6f5ac575a56784ac6461816b67c4f21">Fixes</a> addressing <a href="https://cwiki.apache.org/confluence/display/WW/S2-063">S2-063</a> &amp; <a href="https://cwiki.apache.org/confluence/display/WW/S2-064">S2-064</a> by <a href="https://github.com/yasserzamani"><code>@​yasserzamani</code></a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/apache/struts/compare/STRUTS_2_5_30...STRUTS_2_5_31">https://github.com/apache/struts/compare/STRUTS_2_5_30...STRUTS_2_5_31</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/apache/struts/commits">compare view</a></li>
</ul>
</details>
<br />

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</details>

Fixes #1749

COPYBARA_INTEGRATE_REVIEW=#1749 from google:dependabot/maven/extensions/struts2/org.apache.struts-struts2-core-2.5.31 e9b9dde
PiperOrigin-RevId: 541919125

WORKSPACE

@@ -38,7 +38,7 @@ maven_install(
         "jakarta.inject:jakarta.inject-api:2.0.1",
         "jakarta.persistence:jakarta.persistence-api:3.0.0",
         "jakarta.servlet:jakarta.servlet-api:5.0.0",
-        "org.apache.struts:struts2-core:2.5.30",
+        "org.apache.struts:struts2-core:2.5.31",
         "org.apache.struts.xwork:xwork-core:2.3.37",
         "org.ow2.asm:asm:9.5",
         "org.springframework:spring-core:5.3.18",

extensions/struts2/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>org.apache.struts</groupId>
       <artifactId>struts2-core</artifactId>
-      <version>2.5.30</version>
+      <version>2.5.31</version>
       <scope>provided</scope>
     </dependency>
   </dependencies>