Use runtime when checking for updates.

[Roxedus]

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• [x] I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Currently the artifacts it's checking the version for, are mono based. Radarr no longer offer mono artifacts, and therefore this branch is outdated.

Benefits of this PR and context:

How Has This Been Tested?

Source / References:

[LinuxServer-CI]

I am a bot, here are the test results for this PR: https://ci-tests.linuxserver.io/lspipepr/radarr/nightly-4.0.0.5146-pkg-7c8e800e-pr-144/index.html https://ci-tests.linuxserver.io/lspipepr/radarr/nightly-4.0.0.5146-pkg-7c8e800e-pr-144/shellcheck-result.xml