Remove unused requirement, as of release 0.31.0

[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:

Tidy up

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/bookstack/v0.31.3-pkg-d2172c31-pr-77/index.html https://ci-tests.linuxserver.io/lspipepr/bookstack/v0.31.3-pkg-d2172c31-pr-77/shellcheck-result.xml