Bump the dependencies group in /http4k-app with 2 updates (#206)

Bumps the dependencies group in /http4k-app with 2 updates: [io.mockk:mockk](https://github.com/mockk/mockk) and [org.testcontainers:junit-jupiter](https://github.com/testcontainers/testcontainers-java).


Updates `io.mockk:mockk` from 1.13.11 to 1.13.12
- [Release notes](https://github.com/mockk/mockk/releases)
- [Commits](mockk/mockk@1.13.11...1.13.12)

Updates `org.testcontainers:junit-jupiter` from 1.19.8 to 1.20.0
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.19.8...1.20.0)

---
updated-dependencies:
- dependency-name: io.mockk:mockk
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: org.testcontainers:junit-jupiter
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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

http4k-app/build.gradle.kts

@@ -48,8 +48,8 @@ dependencies {
   testImplementation("org.junit.jupiter:junit-jupiter-api:$junitVersion")
   testImplementation("org.junit.jupiter:junit-jupiter-engine:$junitVersion")
 
-  testImplementation("io.mockk:mockk:1.13.11")
-  testImplementation("org.testcontainers:junit-jupiter:1.19.8")
+  testImplementation("io.mockk:mockk:1.13.12")
+  testImplementation("org.testcontainers:junit-jupiter:1.20.0")
 }
 
 java {