Improvements to events + Laravel/PHP upgrades

Released Nov 16, 2021.

Added/improved:

• Increase default number of events to display [WEB-2316]
• Add timezone to iCal events [WEB-2165]
• Add functionality to duplicate events [WEB-2142]
• Update virtual tours hotspot designs [IP-175]
• Add H4 to paragraph block and style it like bold text to fix wonky styling on internship page [WEB-2323]
• Add CityPASS fields back to Visit page [WEB-2319]
• Upgrade to Laravel 8
• Upgrade PHP 7.4

Fixed:

• Fix highlight previews [WEB-2330]
• Fix "Explore further" date filter for works created in 2020 [ART-45]