fix(deps): bump @nextcloud/vue from 8.20.0 to ^8.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@nextcloud/vue	^8.20.0 -> ^8.21.0

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Release Notes

nextcloud-libraries/nextcloud-vue (@​nextcloud/vue)

v8.21.0

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Full Changelog

🚀 Enhancements

• feat(NcRichText): highlight code syntax if language provided #​6212 (Antreesy)

🐛 Fixed bugs

• fix(NcInputField): correct position of trailing icon in RTL #​6202 (alsulami1)
• fix(NcChip): wrong color-primary-text variable used #​6218 (skjnldsv)
• fix: make sure model event in v-model happens first to avoid regression #​6234 (ShGKme)
• fix(NcTextField): don't fire value-updating events twice #​6235 (ShGKme)
• fix(NcRichContenteditable): support mentions of email/* guests #​6233 (Antreesy)
• fix(NcAppContent): correct splitter color in dark mode when using split-horizontal mode #​6227 (wofferl)
• fix(NcRichContenteditable): do not break adjacent user mentions #​6223 (Antreesy)
• fix(NcRichContenteditable): fix pasting of the content to an empty field #​6241 (DorraJaouad)

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