Update Rust crate icalendar to v0.16.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
icalendar	dependencies	patch	0.16.3 -> 0.16.8

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Release Notes

hoodie/icalendar-rs (icalendar)

### [`v0.16.8`](https://redirect.github.com/hoodie/icalendar-rs/blob/HEAD/CHANGELOG.md#v0168-2024-09-10) [Compare Source](https://redirect.github.com/hoodie/icalendar-rs/compare/v0.16.7...v0.16.8) ##### Fixes - **deps:** update rust crate chrono-tz to 0.10 ([d884935](https://redirect.github.com/hoodie/icalendar-rs/commit/d8849355776863a8ec943535539f025b01949721)) ### [`v0.16.7`](https://redirect.github.com/hoodie/icalendar-rs/blob/HEAD/CHANGELOG.md#v0167-2024-09-08) [Compare Source](https://redirect.github.com/hoodie/icalendar-rs/compare/v0.16.6...v0.16.7) ### [`v0.16.6`](https://redirect.github.com/hoodie/icalendar-rs/blob/HEAD/CHANGELOG.md#v0166-2024-09-08) [Compare Source](https://redirect.github.com/hoodie/icalendar-rs/compare/v0.16.5...v0.16.6) ##### Fixes - remove colon escape in text property ([70d442a](https://redirect.github.com/hoodie/icalendar-rs/commit/70d442a00f0a6db348bf5966f356ae90b76ca278)) ### [`v0.16.5`](https://redirect.github.com/hoodie/icalendar-rs/blob/HEAD/CHANGELOG.md#v0165-2024-08-26) [Compare Source](https://redirect.github.com/hoodie/icalendar-rs/compare/v0.16.4...v0.16.5) ##### Fixes - deprecate pre_alloc version by making the default new generic ([4ba04cb](https://redirect.github.com/hoodie/icalendar-rs/commit/4ba04cb51b2c1c8ab85f91d72ffa3b01b0f2b467)) ### [`v0.16.4`](https://redirect.github.com/hoodie/icalendar-rs/blob/HEAD/CHANGELOG.md#v0164-2024-08-25) [Compare Source](https://redirect.github.com/hoodie/icalendar-rs/compare/v0.16.3...v0.16.4) ##### Fixes - take added space into account when wrapping lines ([b7b35c2](https://redirect.github.com/hoodie/icalendar-rs/commit/b7b35c2c197d234be459dc56b6fdefdd441dc843))

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