[TASK] drop ext_icon.gif (see...
[TASK] drop ext_icon.gif (see https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/12.4/Deprecation-98093-Ext_iconAsExtensionIconFileLocation.html)
[TASK] drop ext_icon.gif (see https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/12.4/Deprecation-98093-Ext_iconAsExtensionIconFileLocation.html)