ci: Fix warning about deprecated images

instana / ruby-sensor

💎 Ruby Distributed Tracing & Metrics Sensor for Instana

https://www.instana.com/

MIT License

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Closed Ferenc- closed 1 year ago

Ferenc- commented 1 year ago

Fixes CircleCI's warning about deprecated images. More information on the image deprecation is available here: https://discuss.circleci.com/t/legacy-convenience-image-deprecation/41034