Increase max-mem of Auth service container

When running the native image based integration tests, the Auth service
sometimes crashes. This might be due to OOM so the container's maximum
memory limit has been increased by 50%.

tests/pom.xml

@@ -630,7 +630,7 @@
         <hono.mqtt-adapter.max-mem>70000000</hono.mqtt-adapter.max-mem>
 
         <hono.auth-server.image>hono-service-auth-native</hono.auth-server.image>
-        <hono.auth-server.max-mem>40000000</hono.auth-server.max-mem>
+        <hono.auth-server.max-mem>60000000</hono.auth-server.max-mem>
         <hono.auth-server.nativeTlsRequired>false</hono.auth-server.nativeTlsRequired>
         <hono.command-router.image>hono-service-command-router-native</hono.command-router.image>
         <hono.command-router.max-mem>100000000</hono.command-router.max-mem>