fix(UploadProgress): migrate NcButton type to variant prop

The 'type' prop for color variants was removed in @nextcloud/vue
v9.0.0 in favour of the 'variant' prop.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/components/UploadProgress.vue

@@ -14,7 +14,7 @@
 			</p>
 		</div>
 		<NcButton class="upload-picker__cancel"
-			type="tertiary"
+			variant="tertiary"
 			:aria-label="t('libresign', 'Cancel upload')"
 			@click="$emit('cancel')">
 			<template #icon>