Update dependencies to platform version 1.28.4

[claymccoy]

Event

{
  "branchName": "release-1.28.x",
  "createTag": true,
  "dependencyUpdates": [
    {
      "depName": "orca",
      "depVersion": "8.24.4"
    },
    {
      "depName": "kork",
      "depVersion": "7.136.1"
    }
  ],
  "hasDependencyUpdates": true,
  "newGradleProperties": "spinnakerRelease=1.28.4\norg.gradle.parallel=true\n\nspinnakerGradleVersion=8.10.0\npf4jVersion=3.2.0\nkorkVersion=7.136.1\norcaVersion=8.24.4\nkotlinVersion=1.3.50",
  "orgName": "spinnaker-plugin-examples",
  "platformVersion": "1.28.4",
  "repoId": "MDEwOlJlcG9zaXRvcnkyMzU0MjYwMTA=",
  "repoName": "pf4jStagePlugin"
}