Bump jna.version from 5.15.0 to 5.16.0 in /apps/backend

Bumps `jna.version` from 5.15.0 to 5.16.0.

Updates `net.java.dev.jna:jna-platform` from 5.15.0 to 5.16.0
- [Changelog](https://github.com/java-native-access/jna/blob/master/CHANGES.md)
- [Commits](java-native-access/jna@5.15.0...5.16.0)

Updates `net.java.dev.jna:jna` from 5.15.0 to 5.16.0
- [Changelog](https://github.com/java-native-access/jna/blob/master/CHANGES.md)
- [Commits](java-native-access/jna@5.15.0...5.16.0)

---
updated-dependencies:
- dependency-name: net.java.dev.jna:jna-platform
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: net.java.dev.jna:jna
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

apps/backend/pom.xml

@@ -33,7 +33,7 @@
         <commons-compress.version>1.27.1</commons-compress.version>
         <commons-io.version>2.18.0</commons-io.version>
         <guava.version>33.3.1-jre</guava.version>
-        <jna.version>5.15.0</jna.version>
+        <jna.version>5.16.0</jna.version>
         <jetbrains.annotation.version>26.0.1</jetbrains.annotation.version>
 
         <!-- Test -->