Bump com.willowtreeapps.assertk:assertk-jvm from 0.22 to 0.28.0

Bumps [com.willowtreeapps.assertk:assertk-jvm](https://github.com/willowtreeapps/assertk) from 0.22 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@v0.22...v0.28.0)

---
updated-dependencies:
- dependency-name: com.willowtreeapps.assertk:assertk-jvm
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -102,7 +102,7 @@ dependencies {
 
     "testLibApi"(kotlin("stdlib-jdk8"))
     // Bumping past 0.22 forces kotlin 1.4.x (Gradle 7+)
-    "testLibApi"("com.willowtreeapps.assertk:assertk-jvm:0.22")
+    "testLibApi"("com.willowtreeapps.assertk:assertk-jvm:0.28.0")
 
     // Bumping these past 2.0.15 forces Gradle 7.x use for newer kotlin
     "testImplementation"("org.spekframework.spek2:spek-dsl-jvm:2.0.15")