Update rockraft file of mlserver-sklearn for CKF 1.8

[kimwnasptd]

What needs to get done

Update the corresponding rockcraft.yaml file to make sure the version of CKF 1.8 is built.

DoD:

• The rockcraft.yaml is updated
• There is automation that builds the image in each PR
• There is automation that pushes the image, once a PR is merged

Why it needs to get done

To make sure we have less CVEs in 1.8 than upstream, and enable us to be able to potentially create patches for package versions in the future

[orfeas-k]

Added a comment in #70 plus some general details in #37.

[syncronize-issues-to-jira[bot]]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5140.

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