fix(repo): drop orphaned error code and dead voice clause (#3376)

packages/errors/src/i18n/ErrorI18nMessages.ts

@@ -339,7 +339,6 @@ export const ERROR_I18N_MESSAGES = {
 		"You've reached the maximum of {count, plural, one {# emoji} other {# emojis}}.",
 	'limits.at_least_one_entry_required': 'At least one entry is required.',
 	'limits.base64_length_invalid': 'Base64 string length must be between {min} and {maxLength} characters.',
-	'limits.cannot_shrink_reserved_slots': "You can't shrink reserved slots.",
 	'limits.cannot_specify_before_and_after': "You can't specify both `before` and `after`.",
 	'limits.content_exceeds_max_length':
 		'Text must not exceed {maxLength, plural, one {# character} other {# characters}}.',