Bump jna-platform from 5.2.0 to 5.3.1 in /core

Bumps [jna-platform](https://github.com/java-native-access/jna) from 5.2.0 to 5.3.1.
- [Release notes](https://github.com/java-native-access/jna/releases)
- [Changelog](https://github.com/java-native-access/jna/blob/master/CHANGES.md)
- [Commits](java-native-access/jna@5.2.0...5.3.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

core/build.gradle

@@ -73,7 +73,7 @@ dependencies {
         exclude(group: "log4j", module: "log4j")
     }
 
-    compile "net.java.dev.jna:jna-platform:5.2.0"
+    compile "net.java.dev.jna:jna-platform:5.3.1"
 
     shaded ('org.scala-sbt.ipcsocket:ipcsocket:1.0.0') {
         exclude(group: "net.java.dev.jna")