Upgrade to AssertK 0.28.0

Bumps [com.willowtreeapps.assertk:assertk-jvm](https://github.com/willowtreeapps/assertk) from 0.27.0 to 0.28.0.
- [Release notes](https://github.com/willowtreeapps/assertk/releases)
- [Changelog](https://github.com/willowtreeapps/assertk/blob/main/CHANGELOG.md)
- [Commits](willowtreeapps/assertk@v0.27.0...v0.28.0)

Author: dependabot[bot]

build.gradle

@@ -55,7 +55,7 @@ ext {
     artemisVersion = '2.31.2'
     aspectjVersion = '1.9.20.1'
     assertjVersion = '3.24.2'
-    assertkVersion = '0.27.0'
+    assertkVersion = '0.28.0'
     avroVersion = '1.11.3'
     awaitilityVersion = '4.2.0'
     camelVersion = '4.2.0'