kcms/keys: enable Accessible properties for actions

Christoph Wolkrequested to merge
cwo/plasma-desktop:keys_enable_acessible_actions into master

Qt allows setting Accessible properties on actions since version 6.8. We prepared some more descriptive labels for kcm_keys buttons a year ago, but depended on 6.8 too close to string freeze to enable them for 6.4.

Let's enable them for 6.5 and make using the software with screen readers slightly less confusing.

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