Change rcon-cli executable

[odakaui]

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Context

• Replace itzg/rcon-cli with gorcon/rcon-cli
• Fix Weird. This response is for another request. error message.

Choices

• This rcon client works with multiple games, not just minecraft.

Test instructions

1. I created a separate container on my local machine.
2. I ran all of the main rcon commands.

Notes

gorcon/rcon-cli treats spaces as multiple commands. So, docker exec palworld-server rcon-cli shutdown 1 no longer works.

The solution is to enclose single commands with quotes. docker exec palworld-server rcon-cli "shutdown 1"

This does not affect the interactive rcon-cli.

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I've added documentation about this change to the README.
• [x] I've not introduced breaking changes.

[thijsvanloef]

@odakaui Thank you for your work, will review tomorrow!