⬆️ Upgrade dependency spatie/icalendar-generator to v3 (#3521)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -35,7 +35,7 @@
     "predis/predis": "^2.0",
     "revolution/laravel-mastodon-api": "^3.0",
     "romanzipp/laravel-queue-monitor": "^5.0",
-    "spatie/icalendar-generator": "^2.0",
+    "spatie/icalendar-generator": "^3.0",
     "spatie/laravel-activitylog": "^4.7",
     "spatie/laravel-permission": "^6.1",
     "spatie/laravel-personal-data-export": "^4.3",