Bump com.github.luben:zstd-jni from 1.5.0-4 to 1.5.6-6 in /lang/java

Bumps [com.github.luben:zstd-jni](https://github.com/luben/zstd-jni) from 1.5.0-4 to 1.5.6-6.
- [Commits](https://github.com/luben/zstd-jni/commits)

---
updated-dependencies:
- dependency-name: com.github.luben:zstd-jni
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

lang/java/pom.xml

@@ -58,7 +58,7 @@
     <easymock.version>4.3</easymock.version>
     <hamcrest.version>2.2</hamcrest.version>
     <grpc.version>1.39.0</grpc.version>
-    <zstd-jni.version>1.5.0-4</zstd-jni.version>
+    <zstd-jni.version>1.5.6-6</zstd-jni.version>
     <!-- version properties for plugins -->
     <archetype-plugin.version>3.2.0</archetype-plugin.version>
     <bundle-plugin-version>5.1.2</bundle-plugin-version>