Bump version after release [skip ci]

Author: thekid

README.md

@@ -35,7 +35,7 @@ Finally, start `xp -v` to see it working:
 
 ```sh
 $ xp -v
-XP 12.4.1-dev { PHP/8.4.6 & Zend/4.4.6 } @ Windows NT SURFACE 10.0 build 26100 (Windows 11) AMD64
+XP 12.5.1-dev { PHP/8.4.8 & Zend/4.4.8 } @ Windows NT SURFACE 10.0 build 26100 (Windows 11) AMD64
 Copyright (c) 2001-2025 the XP group
 FileSystemCL<./src/main/php>
 FileSystemCL<./src/test/php>

src/main/resources/VERSION

@@ -1 +1 @@
-12.5.0
+12.5.1-dev