update png crate

> `Decoder::output_buffer_size` ... now return `Option<usize>` to reflect that these calculations no longer overflow on some targets where the required buffers can not be represented in the address space.

Author: ZeWaka

Cargo.toml

@@ -16,5 +16,5 @@ crc32fast = "1"
 deflate = "1"
 image = { version = "0.25", default-features = false, features = ["png"] }
 inflate = "0.4"
-png = "0.17.16"
+png = "0.18.0"
 thiserror = "2"

src/icon.rs

@@ -221,7 +221,7 @@ impl Icon {
 			// notably does not convert greyscale color types to RGB.
 			png_decoder.set_transformations(Transformations::EXPAND | Transformations::ALPHA);
 			let mut png_reader = png_decoder.read_info()?;
-			let mut rgba_buf = vec![0u8; png_reader.output_buffer_size()];
+			let mut rgba_buf = vec![0u8; png_reader.output_buffer_size().unwrap_or_default()];
 			let info = png_reader.next_frame(&mut rgba_buf)?;
 
 			// EXPAND and ALPHA do not expand grayscale images into RGBA. We can just do this manually.