fix(IdentifySigner): use update:modelValue instead of update:value

In @nextcloud/vue v9.0.0 the 'value' prop and 'update:value' event
were renamed to 'modelValue' and 'update:modelValue' respectively for
NcTextField and related input components.

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

Author: vitormattos

src/components/Request/IdentifySigner.vue

@@ -29,7 +29,7 @@
 			:required="true"
 			:error="nameHaveError"
 			:helper-text="nameHelperText"
-			@update:value="onNameChange" />
+			@update:modelValue="onNameChange" />
 
 		<div v-if="signerSelected && showCustomMessage && !disabled" class="description-wrapper">
 			<NcCheckboxRadioSwitch v-model="enableCustomMessage"