Only use image's PNG feature instead of its default features.

ash-examples/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 publish = false
 
 [dependencies]
-image = "0.25"
+image = { version = "0.25", default-features = false, features = ["png"] }
 winit = { version = "0.29", features = ["rwh_06"] }
 # The examples require the validation layers, which means the SDK or
 # equivalent development packages should be present, so we can link