Update adminer.properties

Author: jwaisner

modules/adminer.properties

@@ -1,3 +1,3 @@
 4.6.1 = https://github.com/Bearsampp/modules-untouched/releases/download/adminer-r4/adminer-4.6.1.7z
 4.8.1 = https://github.com/Bearsampp/modules-untouched/releases/download/Adminer-4.8.1/adminer4.8.1.7z
-5.2.1 = https://github.com/Bearsampp/modules-untouched/releases/download/adminer-2025.4.19/adminer-5.2.1.php
+5.2.1 = https://github.com/Bearsampp/modules-untouched/releases/download/adminer-2025.4.19/adminer5.2.1.7z