automation: Update docker-lemmy Docker tag to v0.19.3

This MR contains the following updates:

Package	Update	Change
docker-lemmy	minor	0.18.5 -> 0.19.3

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⚠ Dependency Lookup Warnings ⚠

Warnings were logged while processing this repo. Please check the Dependency Dashboard for more information.

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Release Notes

LemmyNet/lemmy

v0.19.3: Release

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Release notes

Full Changelog: https://github.com/LemmyNet/lemmy/compare/0.19.2...0.19.3

v0.19.2: Release

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Release Notes

Full Changelog: https://github.com/LemmyNet/lemmy/compare/0.19.1...0.19.2

v0.19.1: Release

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Release Notes

Full Changelog: https://github.com/LemmyNet/lemmy/compare/0.19.0...0.19.1

v0.19.0: Release

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Release notes

Full Changelog: https://github.com/LemmyNet/lemmy/compare/0.18.1...0.19.0

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Configuration

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