Bump HikariCP from 2.6.1 to 3.2.0 in /modules/spock (#1053)

Bumps [HikariCP](https://github.com/brettwooldridge/HikariCP) from 2.6.1 to 3.2.0.
<details>
<summary>Changelog</summary>

*Sourced from [HikariCP's changelog](https://github.com/brettwooldridge/HikariCP/blob/dev/CHANGES).*

> HikariCP Changes
> 
> Changes in 3.2.0
> 
>  * check connection closed condition before attempting to set network timeout to avoid spurios exceptions
>    in the log.
> 
>  * updated validation failure message to include recommendation to check maxLifetime value.
> 
>  * fixed 1141 do not throw SQLException when calling isClosed() or close() on a already closed unwrapped
>    Connection, as per JDBC specification.
> 
>  * fixed 1137 support changing user/password at runtime for DriverDataSource-wrapped driver connections.
> 
>  * fixed 1136 log loaded driver when using jdbcUrl.
> 
>  * pull 1135 extract sealed pool check into independent method.
> 
>  * fixed 1126 correct error in JavaDoc for HikariConfig.setInitializationFailTimeout().
> 
>  * fixed 1114 removed unreachable code.
> 
> Changes in 3.1.0
> 
>  * Add get/setCatalog() to HikariConfigMXBean, allowing the catalog to be changed at runtime.
>    The catalog should only be changed while the pool is suspended, and after evicting existing
>    connections via HikariPoolMXBean.softEvictConnections().
> 
> Changes in 3.0.0
> 
>  * Removed previously deprecated methods;
>      HikariConfig.copyState()
>      HikariConfig.getScheduledExecutorService()
>      HikariConfig.setScheduledExecutorService()
>      HikariConfig.isInitializationFailFast()
>      HikariConfig.setInitializationFailFast()
>      HikariConfig.isJdbc4ConnectionTest()
>      HikariConfig.setJdbc4ConnectionTest()
> 
>      HikariDataSource.copyState()
>      HikariDataSource.getScheduledExecutorService()
>      HikariDataSource.setScheduledExecutorService()
>      HikariDataSource.suspendPool()
>      HikariDataSource.resumePool()
>      HikariDataSource.shutdown()
>      HikariDataSource.isInitializationFailFast()
>      HikariDataSource.setInitializationFailFast()
>      HikariDataSource.isJdbc4ConnectionTest()
>      HikariDataSource.setJdbc4ConnectionTest()
> 
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`ad827db`](brettwooldridge/HikariCP@ad827db) [maven-release-plugin] prepare release HikariCP-3.2.0
- [`0f06b56`](brettwooldridge/HikariCP@0f06b56) Update pom.xml
- [`3498a14`](brettwooldridge/HikariCP@3498a14) Update CHANGES
- [`88b57c3`](brettwooldridge/HikariCP@88b57c3) Check closed condition before attempting to set network timeout.
- [`6a13980`](brettwooldridge/HikariCP@6a13980) Update validation failure message.
- [`603951f`](brettwooldridge/HikariCP@603951f) Fixes [#1126](https://github-redirect.dependabot.com/brettwooldridge/HikariCP/issues/1126) correct error in JavaDoc for HikariConfig.setInitializationFailTi...
- [`5607d8b`](brettwooldridge/HikariCP@5607d8b) Fixes [#1141](https://github-redirect.dependabot.com/brettwooldridge/HikariCP/issues/1141) do not throw SQLException when calling isClosed() or close() on a...
- [`8921bb0`](brettwooldridge/HikariCP@8921bb0) Fixes [#1137](https://github-redirect.dependabot.com/brettwooldridge/HikariCP/issues/1137) support changing user/password at runtime for DriverDataSource-wr...
- [`851e2d4`](brettwooldridge/HikariCP@851e2d4) Fixes [#1137](https://github-redirect.dependabot.com/brettwooldridge/HikariCP/issues/1137) support changing user/password at runtime for DriverDataSource-wr...
- [`71e8688`](brettwooldridge/HikariCP@71e8688) Closes [#1114](https://github-redirect.dependabot.com/brettwooldridge/HikariCP/issues/1114) Remove unneeded code.
- Additional commits viewable in [compare view](brettwooldridge/HikariCP@HikariCP-2.6.1...HikariCP-3.2.0)
</details>
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modules/spock/build.gradle

@@ -10,7 +10,7 @@ dependencies {
 
     testCompile project(':mysql')
     testCompile project(':postgresql')
-    testCompile 'com.zaxxer:HikariCP:2.6.1'
+    testCompile 'com.zaxxer:HikariCP:3.2.0'
 
     testRuntime 'org.postgresql:postgresql:42.0.0'
     testRuntime 'mysql:mysql-connector-java:6.0.6'