automation: Update minecraft-image Docker tag to v2023.8.1

This MR contains the following updates:

Package	Update	Change
minecraft-image	minor	2023.7.1 -> 2023.8.1

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Release Notes

itzg/docker-minecraft-server (minecraft-image)

v2023.8.1

Compare Source

What's Changed

Enhancements

• ftb: added FTB_FORCE_REINSTALL by @​itzg in https://github.com/itzg/docker-minecraft-server/pull/2305
• auto-cf: updated API parsing for NeoForge mod loader type by @​itzg in https://github.com/itzg/docker-minecraft-server/pull/2308

Bug Fixes

• Corrected REMOVE_OLD_MODS to process file-wise by @​itzg in https://github.com/itzg/docker-minecraft-server/pull/2317

Full Changelog: https://github.com/itzg/docker-minecraft-server/compare/2023.7.1...2023.8.1

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