[2.8.x] Support setting of hikari keepaliveTime (backport #11805) by @gheine

[mergify]

This is an automatic backport of pull request #11805 done by Mergify.

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[mkurz]

We can't backport because 2.8.x uses an older version of HikariCP which does not provide yet provide the method necessary:

Error:  /home/runner/work/playframework/playframework/persistence/play-jdbc/src/main/scala/play/api/db/HikariCPModule.scala:122:84: value setKeepaliveTime is not a member of com.zaxxer.hikari.HikariConfig
Error:      config.get[Option[Duration]]("keepaliveTime").foreach(duration => hikariConfig.setKeepaliveTime(toMillis(duration)))
Error:                                                                                     ^
Error:  one error found

We also can't upgrade HikariCP in 2.8.x because newer releases dropped support for Java 8