Upgrade Doorkeeper gems

What does this MR do and why?

• Upgrade doorkeeper minor version just to keep things up to date.

• https://my.diffend.io/gems/doorkeeper/5.5.4/5.6.4

• https://github.com/doorkeeper-gem/doorkeeper/blob/main/CHANGELOG.md

• This upgrade also required us to upgrade doorkeeper-openid_connect because 5.6.3 removed deprecated active_record_options config option and doorkeeper-openid_connect added a fix in 1.8.4 to remove a reference to active_record_options: https://github.com/doorkeeper-gem/doorkeeper-openid_connect/blob/master/CHANGELOG.md#v184-2023-02-01

• https://my.diffend.io/gems/doorkeeper-openid_connect/1.8.3/1.8.5

• Includes upgrades and security fixes

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.