Update a variant.

curl --request PATCH \
  --url https://api.aasaan.shop/api/v1/stores/products/{productId}/variants/{variantId} \
  --header 'Content-Type: application/json' \
  --data '{
  "quantity": 1,
  "variantAttributeValues": [
    {
      "name": "color",
      "value": "brown"
    }
  ],
  "prices": [
    {
      "channelId": "636f2e876e9de14bfe1b02f1",
      "salesPrice": "45",
      "regularPrice": "50"
    }
  ],
  "description": "Now, ensure the good health of your hair with Head & Shoulders Anti Hairfall Anti Dandruff Shampoo that strengthens hair from its roots and cures dandruff. Be it dry, frizzy, or damaged, this shampoo can bring back the younger days of your hair within just a few days. The shampoo is richly indulgent and improves the experience of washing your hair. It makes your hair dandruff-free up to 100%. Do not fret over chemicals as the product is gentle in use and can be used every day.",
  "shortDescription": "Anti Dandruff Shampoo that strengthens hair from its roots and cures dandruff",
  "active": true,
  "outOfStock": false,
  "width": 100,
  "height": 200,
  "depth": 20,
  "weight": 500,
  "isShippingEnabled": true,
  "seo": {
    "title": "Head and Shoulders",
    "description": "Head & Shoulders Anti Hairfall Anti Dandruff Shampoo that strengthens hair",
    "image": {
      "url": "https://images.aasaan.app/123412421",
      "type": "image/png"
    }
  },
  "images": [
    {
      "id": 0,
      "url": "https://images.aasaan.app/123412421",
      "type": "https://images.aasaan.app/123412421"
    }
  ]
}'

{
  "id": "623d3455ec3c4b3548eb4a343",
  "names": "XL, Brown",
  "sku": "000-000-000-000",
  "slug": "head_shoulders_anti_hairfall_anti_dandruff_shampoo_650_ml_22",
  "quantity": 1,
  "description": "Now, ensure the good health of your hair with Head & Shoulders Anti Hairfall Anti Dandruff Shampoo that strengthens hair from its roots and cures dandruff. Be it dry, frizzy, or damaged, this shampoo can bring back the younger days of your hair within just a few days. The shampoo is richly indulgent and improves the experience of washing your hair. It makes your hair dandruff-free up to 100%. Do not fret over chemicals as the product is gentle in use and can be used every day.",
  "shortDescription": "Anti Dandruff Shampoo that strengthens hair from its roots and cures dandruff",
  "active": true,
  "outOfStock": false,
  "width": 100,
  "height": 200,
  "depth": 20,
  "weight": 500,
  "isShippingEnabled": true,
  "seo": {
    "title": "Head and Shoulders",
    "description": "Head & Shoulders Anti Hairfall Anti Dandruff Shampoo that strengthens hair",
    "image": {
      "url": "https://images.aasaan.app/123412421",
      "type": "image/png"
    }
  },
  "images": [
    {
      "id": 0,
      "url": "https://images.aasaan.app/123412421",
      "type": "image/png"
    }
  ],
  "date_created": "2022-03-25T03:17:44.092Z",
  "date_modified": "2022-06-10T07:51:12.510Z",
  "prices": [
    {
      "channelId": "636f2e876e9de14bfe1b02f1",
      "salesPrice": "45",
      "regularPrice": "50"
    }
  ]
}