Merge Floodgate changes

bootstrap/bukkit/src/main/java/org/geysermc/platform/bukkit/GeyserBukkitConfiguration.java

@@ -96,6 +96,11 @@ public class GeyserBukkitConfiguration implements IGeyserConfiguration {
         return config.getBoolean("allow-third-party-capes", true);
     }
 
+    @Override
+    public String getFloodgateKeyFile() {
+        return config.getString("floodgate-key-file", "public-key.pem");
+    }
+
     @Override
     public IMetricsInfo getMetrics() {
         return metricsInfo;