chore(deps): update dependency org.hibernate:hibernate-core to v5.4.13.final (GoogleCloudPlatform#2510)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [org.hibernate:hibernate-core](http://hibernate.org/orm) ([source](https://togithub.com/hibernate/hibernate-orm)) | patch | `5.4.12.Final` -> `5.4.13.Final` |

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### Release Notes

<details>
<summary>hibernate/hibernate-orm</summary>

### [`v5.4.13.Final`](https://togithub.com/hibernate/hibernate-orm/blob/master/changelog.txt#Changes-in-5413Final-March-26-2020)

[Compare Source](https://togithub.com/hibernate/hibernate-orm/compare/5.4.12...5.4.13)

<https://hibernate.atlassian.net/projects/HHH/versions/31829/tab/release-report-done>

\*_ Bug
    _  [HHH-13322] - Sequence increment is not correctly determined
    _  [HHH-13619] - size() does not work properly as select expression
    _  [HHH-13711] - H2 dialect not accurate for drop table since version 1.4.200
    _  [HHH-13870] - Gradle plugin causes compile task to be always out of date
    _  [HHH-13875] - Optional one-to-one does not always join the associated entity table when querying
    _  [HHH-13876] - Fix an obvious bug in StandardStack implementation
    _  [HHH-13891] - ProxyFactory should not be built if any ID or property getter/setter methods are final
    \*  [HHH-13910] - MySQL57Dialect selected by automatic dialect resolution when using MySQL 8.0 database

\*_ New Feature
    _  [HHH-13799] - JPA Criteria API support for Hibernate Spatial

\*_ Task
    _  [HHH-13874] - Deprecate relevant methods that are supposed to be removed in v6.0

\*_ Improvement
    _  [HHH-13103] - Allow Hibernate Types to get access to the current configuration properties using constructor injection
    _  [HHH-13853] - Pass the merged Integration settings and Persistence Unit properties to buildBootstrapServiceRegistry
    _  [HHH-13855] - Remove unnecessary declaration of JtaManager in HibernatePersistenceProviderAdaptor
    _  [HHH-13872] - Make the Java Stream close the underlying ScrollableResultsIterator upon calling a terminal operation
    _  [HHH-13873] - IdTableHelper can skip opening a connection when there's no statements to execute
    _  [HHH-13878] - Increase the scope of some methods to make them accessible outside of Hibernate ORM
    _  [HHH-13879] - Slow query log should use System#nanoTime not System#currentTimeMillis
    \*  [HHH-13897] - ResultSetProcessingContextImpl: no need to clear collections before discarding the reference to them

</details>

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spanner/hibernate/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>org.hibernate</groupId>
       <artifactId>hibernate-core</artifactId>
-      <version>5.4.12.Final</version>
+      <version>5.4.13.Final</version>
     </dependency>
   </dependencies>
   <!-- [END spanner_hibernate_dependencies] -->