update kirby to v5 and add refresh cache panel view button

public/kirby/src/Form/Mixin/Min.php

@@ -8,6 +8,11 @@ trait Min
 
 	public function min(): int|null
 	{
+		// set min to at least 1, if required
+		if ($this->required === true) {
+			return $this->min ?? 1;
+		}
+
 		return $this->min;
 	}
 
@@ -15,4 +20,14 @@ trait Min
 	{
 		$this->min = $min;
 	}
+
+	public function isRequired(): bool
+	{
+		// set required to true if min is set
+		if ($this->min) {
+			return true;
+		}
+
+		return $this->required;
+	}
 }