ORC-1781: Upgrade zstd-jni to 1.5.6-6

Bumps [com.github.luben:zstd-jni](https://github.com/luben/zstd-jni) from 1.5.6-5 to 1.5.6-6.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/luben/zstd-jni/commit/d82a029bff57af6075789d53b171714c90ca1471"><code>d82a029</code></a> v1.5.6-6</li>
<li><a href="https://github.com/luben/zstd-jni/commit/3bb199c95d8eca0a8392f6d72d84669c60227577"><code>3bb199c</code></a> Use PVP versioning for SBT</li>
<li><a href="https://github.com/luben/zstd-jni/commit/3ca26eed6c84fb09c382854ead527188e643e206"><code>3ca26ee</code></a> Allow including compression level when training a dictionary: The compression...</li>
<li><a href="https://github.com/luben/zstd-jni/commit/eea07fc73f35f9f1ae4ae3676da93f4f6e14942a"><code>eea07fc</code></a> Document aix-ppc64 as supported by the public build</li>
<li>See full diff in <a href="https://github.com/luben/zstd-jni/compare/v1.5.6-5...v1.5.6-6">compare view</a></li>
</ul>
</details>
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Closes #2036 from dependabot[bot]/dependabot/maven/java/com.github.luben-zstd-jni-1.5.6-6.

Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
(cherry picked from commit 92c9e3c)
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

java/pom.xml

@@ -83,7 +83,7 @@
     <storage-api.version>2.8.1</storage-api.version>
     <surefire.version>3.0.0-M5</surefire.version>
     <test.tmp.dir>${project.build.directory}/testing-tmp</test.tmp.dir>
-    <zstd-jni.version>1.5.6-5</zstd-jni.version>
+    <zstd-jni.version>1.5.6-6</zstd-jni.version>
   </properties>
 
   <dependencyManagement>