Bump io.mockk:mockk in /http4k-app in the dependencies group (#285)

Bumps the dependencies group in /http4k-app with 1 update: [io.mockk:mockk](https://github.com/mockk/mockk).


Updates `io.mockk:mockk` from 1.13.17 to 1.14.0
- [Release notes](https://github.com/mockk/mockk/releases)
- [Commits](mockk/mockk@1.13.17...1.14.0)

---
updated-dependencies:
- dependency-name: io.mockk:mockk
  dependency-version: 1.14.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

http4k-app/build.gradle.kts

@@ -48,7 +48,7 @@ dependencies {
   testImplementation("org.junit.jupiter:junit-jupiter-api:$junitVersion")
   testImplementation("org.junit.jupiter:junit-jupiter-engine:$junitVersion")
 
-  testImplementation("io.mockk:mockk:1.13.17")
+  testImplementation("io.mockk:mockk:1.14.0")
   testImplementation("org.testcontainers:junit-jupiter:1.20.6")
 }