[Ubuntu] Fix Swift installer

[erik-bershel]

Description

Use key-server instead of key-file when installing Swift.

Related issue:

https://github.com/actions/runner-images/issues/9664

Check list

• [x] Related issue / work item is attached
• [ ] Tests are written (if applicable)
• [ ] Documentation is updated (if applicable)
• [ ] Changes are tested and related VM images are successfully generated

[mikhailkoliada]

/azp run ubuntu2004,ubuntu2204

[azure-pipelines[bot]]

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