fix(java17): mak fields transient (#115)

* make SetTargetToNearbyBlockAwayFromInstigatorAction#random field transient
* make NearbyBlockRestricted#random transient

src/main/java/org/terasology/module/behaviors/actions/NearbyBlockRestricted.java

@@ -39,7 +39,7 @@ public class NearbyBlockRestricted extends BaseAction {
     /**
      * The random number provider for choosing the nearby block.
      */
-    private final Random random = new Random();
+    private final transient Random random = new Random();
     /**
      * The world region that this character is allowed to stray in. Defines an x&z area in world space.
      */

src/main/java/org/terasology/module/behaviors/actions/SetTargetToNearbyBlockAwayFromInstigatorAction.java

@@ -35,7 +35,7 @@ public class SetTargetToNearbyBlockAwayFromInstigatorAction extends BaseAction {
 
     private static final int RANDOM_BLOCK_ITERATIONS = 10;
 
-    private final Random random = new Random();
+    private final transient Random random = new Random();
 
     @In
     private PluginSystem movementPluginSystem;