chore: updated CHANGELOG.md

Author: andreasvikke

CHANGELOG.md

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+## 2.2.7 (Sept 9, 2025). Tested on Artifactory 7.117.19 with Terraform 1.14.0 and OpenTofu 1.10.6
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+IMPROVEMENTS:
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+* resource/platform_workers_service: Added support for `SCHEDULED_EVENT` action type [#197](https://github.com/jfrog/terraform-provider-platform/issues/197) PR: [#281](https://github.com/jfrog/terraform-provider-platform/pull/281)
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 ## 2.2.6 (Sept 9, 2025). Tested on Artifactory 7.117.15 with Terraform 1.13.1 and OpenTofu 1.10.6
 
 IMPROVEMENTS: