Fix ics alert not working when a date is set

(cherry picked from commit fa847d9)

Merge pull request #190 from spatie/2.x

[2.x] Types; no magic, final, strict_types;

Fix styling

Use method extraction, fix issues reported by Psalm

Merge pull request #187 from spatie/update-dependencies

Update dependencies

Merge pull request #186 from atymic/fix/outlook-web

fix: web outlook url

Merge pull request #169 from thinkshout/fix-utc-dates

Add back the Z marker for UTC times

Update snapshots

Update tests to account for new datetime format

(cherry picked from commit 8db7d3e)

Escape ICS DESCRIPTION