[zlib-ng] Update to 2.1.6

[luncliff]

Changes

Update to the latest version

References

• https://github.com/zlib-ng/zlib-ng/releases/tag/2.1.6
• [zlib-ng] update to 2.0.7 #94

Triplet Support

• x64-windows
• x64-linux
• x64-osx

Configuration

"vcpkg-configuration.json" changes for the release.

{
    "registries": [
        {
            "kind": "git",
            "repository": "https://github.com/luncliff/vcpkg-registry",
            "packages": [
                "zlib-ng"
            ],
            "baseline": "..."
        }
    ]
}