fix(deps): update dependency ical-generator to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ical-generator	^3.6.1 -> ^4.0.0

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Release Notes

sebbo2002/ical-generator

v4.0.0

Compare Source

Bug Fixes

• Event: Add RRULE: prefix in event.repeating() if it's not already there (92c2034), closes #​459
• Update escaping for quoted values (faf5c70), closes #​463

Build System

• Deprecate node.js 12 (426588b)
• Native ESM support (7b86a4f)

Features

• ESM Module (7e1f07a)

BREAKING CHANGES

• Importing the generator with const ical = require('ical-generator'); (introduced with 2.1.0 / #​253) will not work anymore, please use const { default: ical } = require('ical-generator'); or move to fancy ESM imports (import ical from 'ical-generator' ;).
• From now on, only node.js ^14.8.0 || >=16.0.0 are supported
• Only Support for node.js ^12.20.0 || >=14.13.1

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