Updates Kotlin for DataLayer sample

[kul3r4]

Looking at fixing the failure in #1232.
We have a rule to in renovate.json which I can't remember anymore why it's there, the sample seems to be working well with newest Kotlin/kotlinx

{
      "matchPackagePatterns": [
        "org.jetbrains.kotlin.*"
      ],
      "groupName": "kotlin",
      "allowedVersions": "<2.0.0"
    },