Update phone number validation rules

Ensure phone numbers are 6-15 characters in length and either numeric or start with a '+'
This is to ensure that we can accept numbers from various sources while safeguarding against sending a number to the API that might cause an error.

src/apps/patron-page/PatronPage.dev.tsx

@@ -241,8 +241,9 @@ export default {
       control: { type: "text" }
     },
     phoneInputMessageText: {
+      name: "Phone input validation message",
       defaultValue:
-        "The phone number should be from Denmark (+45), Germany (+49), or Greenland (+299)",
+        "The phone number must be 6 to 15 characters in length and should be comprised solely of numbers or begin with a +",
       control: { type: "text" }
     }
   }

src/components/contact-info-section/ContactInfoPhone.tsx

@@ -29,7 +29,7 @@ const ContactInfoPhone: FC<ContactInfoPhoneProps> = ({
         id="phone-input"
         required={isRequired}
         type="tel"
-        pattern="(\+45|0045)[0-9]{8}|(\+49|0049)[0-9]{7,11}|(\+299|00299)[0-9]{6}"
+        pattern="\+?[0-9]{6,15}"
         title={t("phoneInputMessageText")}
         onChange={(newPhoneNumber) =>
           changePatron(newPhoneNumber, "phoneNumber")