fix(Shipment Parcel): make length, width and height non-mandatory

It's tedious to enter all these values and some shipping providers only need to know the weigth and quantity. Companies can alwas cutomize the values to be mandatory, but the reverse is not possible. I'll make sure that the erpnext-shipping app does not break because of this (or fix any problems).

erpnext/stock/doctype/shipment_parcel/shipment_parcel.json

@@ -16,22 +16,19 @@
    "fieldname": "length",
    "fieldtype": "Int",
    "in_list_view": 1,
-   "label": "Length (cm)",
-   "reqd": 1
+   "label": "Length (cm)"
   },
   {
    "fieldname": "width",
    "fieldtype": "Int",
    "in_list_view": 1,
-   "label": "Width (cm)",
-   "reqd": 1
+   "label": "Width (cm)"
   },
   {
    "fieldname": "height",
    "fieldtype": "Int",
    "in_list_view": 1,
-   "label": "Height (cm)",
-   "reqd": 1
+   "label": "Height (cm)"
   },
   {
    "fieldname": "weight",
@@ -52,7 +49,7 @@
  ],
  "istable": 1,
  "links": [],
- "modified": "2020-07-09 12:54:14.847170",
+ "modified": "2024-03-06 16:48:57.355757",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Shipment Parcel",
@@ -61,5 +58,6 @@
  "quick_entry": 1,
  "sort_field": "modified",
  "sort_order": "DESC",
+ "states": [],
  "track_changes": 1
 }