ci: Run cypress tests properly again on CI · nextcloud/viewer@79ec425

The following actions use a deprecated Node.js version and will be forced to run on node20: buildjet/cache/restore@e376f15c6ec6dc595375c78633174c7e5f92dc0e. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Failed to restore: "/usr/bin/tar" failed with error: The process '/usr/bin/tar' failed with exit code 2

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