Update UPGRADING.md

Author: ondrejmirtes

UPGRADING.md

@@ -112,10 +112,6 @@ Appending `(?)` in `ignoreErrors` is not supported.
   * `constant_hassers` -> use `constantHassers`
   * `console_application_loader` -> use `consoleApplicationLoader`
 
-### Docker images no longer tagged without a PHP version
-
-Tags without a PHP version are no longer published - `nightly`, `2`, `latest` are no longer updated. Instead, use `nightly-php8.3`, `2-php8.3`, `latest-php8.3`. You can replace `8.3` with PHP versions `8.0`-`8.3`.
-
 ### Minor backward compatibility breaks
 
 * Removed unused config parameter `cache.nodesByFileCountMax`