Vendor dependencies for 0.3.0 release

vendor/cfg-if/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.0.3](https://github.com/rust-lang/cfg-if/compare/v1.0.2...v1.0.3) - 2025-08-19
+
+- Revert "Remove `@__identity` rule."
+
+## [1.0.2](https://github.com/rust-lang/cfg-if/compare/v1.0.1...v1.0.2) - 2025-08-19
+
+- Remove `@__identity` rule.
+
+## [1.0.1](https://github.com/rust-lang/cfg-if/compare/v1.0.0...v1.0.1) - 2025-06-09
+
+- Remove `compiler-builtins` from `rustc-dep-of-std` dependencies
+- Remove redundant configuration from Cargo.toml
+- More readable formatting and identifier names. ([#39](https://github.com/rust-lang/cfg-if/pull/39))
+- Add expanded example to readme ([#38](https://github.com/rust-lang/cfg-if/pull/38))