Update to Zig 0.16.0 (#962)

Signed-off-by: AnErrupTion <anerruption@disroot.org>

## What are the changes about?

Ports the code base to Zig 0.16.0.

## What existing issue does this resolve?

N/A

## Pre-requisites

- [x] I have tested & confirmed the changes work locally
- [x] I have run `zig fmt` throughout my changes

Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/962

src/components/UserList.zig

@@ -26,6 +26,7 @@ label: *UserLabel,
 
 pub fn init(
     allocator: Allocator,
+    io: std.Io,
     buffer: *TerminalBuffer,
     usernames: StringList,
     saved_users: *SavedUsers,
@@ -39,6 +40,7 @@ pub fn init(
         .instance = null,
         .label = try UserLabel.init(
             allocator,
+            io,
             buffer,
             drawItem,
             usernameChanged,