Update dependency discord-webhook to v1.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
discord-webhook	1.1.0 -> 1.2.0

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Release Notes

lovvskillz/python-discord-webhook (discord-webhook)

### [`v1.2.0`](https://togithub.com/lovvskillz/python-discord-webhook/blob/HEAD/CHANGES.md#2023-07-24-120) [Compare Source](https://togithub.com/lovvskillz/python-discord-webhook/compare/1.1.0...1.2.0) ##### 🎉 Features - `set_timestamp()` accepts also a datetime object - set timestamp as ISO 8601 ##### 🩹 Fixes - fix rate limit retry

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