Remove unused extension

composer.json

@@ -22,7 +22,6 @@
     "kigkonsult/icalcreator": "^2.29",
     "league/csv": "^9.2",
     "league/period": "^4.9",
-    "lochmueller/staticfilecache": "^10.2",
     "ssch/typo3-encore": "^2.0",
     "symfony/http-client": "^4.3",
     "symfony/options-resolver": "^4.2",