chore: prepare release of v8.26.0

[susnux]

Due to a "bug" in our release workflow the v9 was published on the latest tag.
This will cause all users of @nextcloud/vue to receive that as a dependabot update.
So to prevent this we need to release a new v8 version.

To prevent this in the future the release workflow is fixed in:
#6841

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v8.26.0 (2025-04-25)

📝 Notes

NcAppSidebar

The info slot was introduced to allow customization of sidebar header content.
This will replace original main name of the sidebar and header, subname, secondary-actions, tertiary-actions slots.
It it recommended to use slot together with NcAppSidebarHeader component to support accessibility features.

NcPopover

The focusTrap property is now deprecated and will be replaced with noFocusTrap,
the reason behind this is to only have boolean properties with default value of false allowing shortcut props.

🚀 Enhancements

• [stable8] feat(NcAppSidebar): add info slot #6843
• [stable8] feat(NcPopover): add new noFocusTrap prop #6808

🐛 Fixed bugs

• [stable8] fix(NcRichText): references prop type #6800
• [stable8] fix(NcAppContent): don't remove list when showing details in mobile or no-split mode #6261 (wofferl)
• [stable8] fix(NcMentionBubble): position selectable text aligned with the component #6837
• [stable8] fix(NcAvatar): do not load avatar from server, if iconClass was provided #6836
• [stable8] fix(NcSelectUsers): add missing search event #6838