Update dependency discord-webhook to v1.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
discord-webhook	1.3.0 -> 1.3.1

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Release Notes

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

### [`v1.3.1`](https://togithub.com/lovvskillz/python-discord-webhook/blob/HEAD/CHANGES.md#2024-01-31-131) [Compare Source](https://togithub.com/lovvskillz/python-discord-webhook/compare/1.3.0...1.3.1) ##### 🩹 Fixes - fix typing for allowed_mentions

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