Fix labels for `coxph` models #29

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1 error and 3 warnings

Failed to get R 4.3.1: Failed to get R 4.3.1: Failed to download version 4.3.1: Error: Unexpected HTTP response: 404

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, r-lib/actions/setup-pandoc@v1, r-lib/actions/setup-r@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

r-lib/actions/setup-pandoc@v1 is deprecated. Please update your workflow to use the 'v2' version.

r-lib/actions/setup-r@v1 is deprecated. Please update your workflow to use the 'v2' version. Also look at the examples at https://github.com/r-lib/actions/tree/v2/examples because '@v2' workflows are much simpler than 'v1' workflows.