refactor: migrate JodaTime to java.time (rebuild on subdate2 ab96cfc)

Complete the JodaTime -> java.time migration across 30 files on the
correct subdate2 base. No org.joda references remain.

src/engine/gameManager/BuildingManager.java

@@ -274,7 +274,7 @@ public enum BuildingManager {
 
         if (building == null)
             return;
-        if (!DbManager.BuildingQueries.updateBuildingUpgradeTime(upgradeDateTime, building, rankCost)) {
+        if (!DbManager.BuildingQueries.updateBuildingUpgradeTime(upgradeDateTime.atZone(ZoneId.systemDefault()).toInstant(), building, rankCost)) {
             Logger.error("Failed to set upgradeTime for building " + building.getObjectUUID());
             return;
         }