fix: read the licence limits model through Jackson 3

The deserialization test was added by this branch, so the merge left it on the
Jackson 2 object mapper the rest of the codebase has moved off.

Author: dkrizan

ee/backend/tests/src/test/kotlin/io/tolgee/ee/unit/eeSubscription/SelfHostedUsageLimitsModelDeserializationTest.kt

@@ -1,9 +1,9 @@
 package io.tolgee.ee.unit.eeSubscription
 
-import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import io.tolgee.hateoas.limits.SelfHostedUsageLimitsModel
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
+import tools.jackson.module.kotlin.jacksonObjectMapper
 
 /**
  * An instance can run a newer version than the licensing server it talks to, so the licence