Downgrade JNA version to 5.12

JNA 5.13 on linux-riscv64 introduces dependency on GLIBC 2.34. It's been
reported at java-native-access/jna#1557.

pom.xml

@@ -133,7 +133,7 @@ The following provides more details on the included cryptographic software:
     <japicmp.skip>false</japicmp.skip>
 
     <commons.release.isDistModule>true</commons.release.isDistModule>
-    <jna.version>5.13.0</jna.version>
+    <jna.version>5.12.0</jna.version>
 
     <!-- The property "target.name" is used to specify the ant target, The "all" target will use
     OsInfo.java to detect the OS info and arch to generate the native binary for detected platform.