Update apps.json from ProStore v1.5.4

Author: github-actions[bot]

apps.json

@@ -25,6 +25,16 @@
         "https://raw.githubusercontent.com/ProStore-iOS/ProStore/refs/heads/main/gallery/Screenshot5.png"
       ],
       "versions": [
+        {
+          "version": "1.5.4",
+          "date": "2025-09-22T06:43:50+0000",
+          "localizedDescription": "What's new in Version 1.5.4?\n- Update to v1.5.4\n- Add back cert name generator",
+          "downloadURL": "https://github.com/ProStore-iOS/ProStore/releases/download/v1.5.4/com.prostoreios.prostore-unsigned-ios.ipa",
+          "size": 3532894,
+          "sha256": "7d156936d18c49a1241da89753f71abd356b6cb7b4e27d8ecccc4a1ffc0d3db0",
+          "minOSVersion": "16.0",
+          "fullDate": "20250922064350"
+        },
         {
           "version": "1.5.3",
           "date": "2025-09-22T06:33:24+0000",