Upgrade to latest versions

[Mahoney]

• gradle 5.2.1 -> 8.1.1
• kotlin 1.3.50 -> 1.8.21
• http4k 3.196.0 -> 4.46.0.0
• log4j 2.12.1 -> 2.15.2
• jackson 2.10.0 -> 2.15.2
• kotest 4.0.5 -> 5.6.2
• ben-manes.versions 0.26.0 -> 0.46.0
• exposed 0.13.6 -> 0.17.14
• h2 1.4.198 -> 1.4.200
• mockk 1.9.3 -> 1.13.5

Not updated:

• h2 1.x -> 2.x
• com.sun.xml.bind:jaxb-core 2.x -> 4.x
• com.sun.xml.bind:jaxb-impl 2.x -> 4.x
• javax.xml.bind:jaxb-api 2.x -> ??? (doesn't exist)