Use PHP 8.3 also for previous major

private-modules-overrides.yml

@@ -6,6 +6,7 @@ variables:
   # Always test modules with latest PHP version.
   PHP_VERSION: '8.3'
   CORE_PHP_MAX: '8.3'
+  CORE_PREVIOUS_PHP_MIN: '8.3'
   _TARGET_PHP: '8.3'
 
 .provide-info-yml-if-needed: &provide-info-yml-if-needed