update composer dependencies for import-category

Author: kenza-ya

composer.json

@@ -13,7 +13,7 @@
         "techdivision/import-attribute-set": "16.0.3",
         "techdivision/import-customer": "16.0.4",
         "techdivision/import-customer-address": "16.0.5",
-        "techdivision/import-category": "20.0.14",
+        "techdivision/import-category": "20.0.15",
         "techdivision/import-category-ee": "21.0.4",
         "techdivision/import-product": "24.0.13",
         "techdivision/import-product-msi": "19.0.2",