ircd: update ghcr.io/ergochat/ergo Docker tag to v2.13.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/ergochat/ergo	Kustomization	patch	v2.13.0 -> v2.13.1

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Release Notes

ergochat/ergo (ghcr.io/ergochat/ergo)

### [`v2.13.1`](https://togithub.com/ergochat/ergo/releases/tag/v2.13.1) [Compare Source](https://togithub.com/ergochat/ergo/compare/v2.13.0...v2.13.1) Ergo 2.13.1 is a bugfix release, fixing an exploitable deadlock that could lead to a denial of service. We regret the oversight. This release includes no changes to the config file format or database format. ##### Security - Fixed an exploitable deadlock that could lead to a denial of service ([#​2149](https://togithub.com/ergochat/ergo/issues/2149)) ##### Internal - Official release builds use Go 1.22.2

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