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/animations/ColorMix.zig

@@ -113,7 +113,7 @@ fn draw(self: *ColorMix) void {
                 uv -= @splat(1.0 * math.cos(uv[0] + uv[1]) - math.sin(uv[0] * 0.7 - uv[1]));
             }
 
-            const cell = self.palette[@as(usize, @intFromFloat(math.floor(length(uv) * 5.0))) % palette_len];
+            const cell = self.palette[@as(usize, @trunc(math.floor(length(uv) * 5.0))) % palette_len];
             cell.put(x, y);
         }
     }