chore(env): update MAGE-X version to v1.20.3

Author: mrz1836

.github/env/10-mage-x.env

@@ -36,7 +36,7 @@
 # ================================================================================================
 
 # MAGE-X version
-MAGE_X_VERSION=v1.20.2
+MAGE_X_VERSION=v1.20.3
 
 # For mage-x development, set to 'true' to use local version instead of downloading from releases
 MAGE_X_USE_LOCAL=false