zk: Add version 0.15.1

[felixhudson]

Add the zk app to the main bucket

See package request for app here
#6779

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zk

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[jack-mil]

This submission is missing several parts of the manifest. Please update it.

Please name your PR in the format: zk: Add version 0.15.1

A working manifest that I tested locally with all required fields is below:

{
    "version": "0.15.1",
    "description": "A plain text note-taking assistant",
    "homepage": "https://github.com/zk-org/zk",
    "license": "GPL-3.0-or-later",
    "architecture": {
        "64bit": {
            "url": "https://github.com/zk-org/zk/releases/download/v0.15.1/zk-v0.15.1-windows-x86_64.tar.gz",
            "hash": "b78d9b37ac14e6dc6150e6ee4c0ffa754935abbdafc584cea311dd6d71dff0ba"
        }
    },
    "bin": "zk.exe",
    "checkver": "github",
    "autoupdate": {
        "architecture": {
            "64bit": {
                "url": "https://github.com/zk-org/zk/releases/download/v$version/zk-v$version-windows-x86_64.tar.gz"
            }
        }
    }
}

[felixhudson]

Ok I think I have fixed all of the issues you sent to me.