chore(deps): update rust crate png to 0.18

Author: renovate[bot]

crates/tauri-codegen/Cargo.toml

@@ -31,7 +31,7 @@ brotli = { version = "8", optional = true, default-features = false, features =
 uuid = { version = "1", features = ["v4"] }
 semver = "1"
 ico = "0.4"
-png = "0.17"
+png = "0.18"
 json-patch = "3"
 url = "2"