refactor: update code base to php 8 and set phpstan lvl to 6

app/Libraries/ActivityPub/Models/NoteModel.php

app/Libraries/ActivityPub/Models/PreviewCardModel.php

app/Libraries/ActivityPub/Objects/ActorObject.php

app/Libraries/ActivityPub/Objects/NoteObject.php

...Libraries/ActivityPub/Objects/OrderedCollectionObject.php

app/Libraries/ActivityPub/WebFinger.php

app/Libraries/Analytics/AnalyticsTrait.php

app/Libraries/Analytics/Config/Analytics.php

app/Libraries/Analytics/Controllers/AnalyticsController.php

...ries/Analytics/Controllers/EpisodeAnalyticsController.php

app/Libraries/Analytics/Controllers/EpisodeController.php

...ies/Analytics/Controllers/UnknownUserAgentsController.php

...braries/Analytics/Entities/AnalyticsPodcastsByCountry.php

...ibraries/Analytics/Entities/AnalyticsPodcastsByRegion.php

...braries/Analytics/Entities/AnalyticsPodcastsByService.php

...ibraries/Analytics/Entities/AnalyticsUnknownUserAgent.php

app/Libraries/Analytics/Helpers/analytics_helper.php

...ries/Analytics/Models/AnalyticsUnknownUseragentsModel.php

app/Libraries/Analytics/Models/UnknownUserAgentsModel.php

app/Libraries/Breadcrumb.php