Update docker.io/metio/matrix-alertmanager-receiver Docker tag to v2024.8.21

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
docker.io/metio/matrix-alertmanager-receiver	minor	2024.7.3 -> 2024.8.21

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Release Notes

metio/matrix-alertmanager-receiver (docker.io/metio/matrix-alertmanager-receiver)

### [`v2024.8.21`](https://togithub.com/metio/matrix-alertmanager-receiver/releases/tag/2024.8.21) [Compare Source](https://togithub.com/metio/matrix-alertmanager-receiver/compare/2024.7.3...2024.8.21) #### What's Changed - chore(deps): bump github.com/prometheus/client_golang from 1.19.1 to 1.20.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/metio/matrix-alertmanager-receiver/pull/32](https://togithub.com/metio/matrix-alertmanager-receiver/pull/32) - chore(deps): bump github.com/prometheus/client_golang from 1.20.0 to 1.20.1 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/metio/matrix-alertmanager-receiver/pull/33](https://togithub.com/metio/matrix-alertmanager-receiver/pull/33) **Full Changelog**: https://github.com/metio/matrix-alertmanager-receiver/compare/2024.7.3...2024.8.21

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