[cupertino_http] Migrate to FFIgen 22

[liamappelbe]

Won't land this until FFIgen is published.

[github-actions]

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License Headers ✔️

// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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pkgs/cupertino_http/example/example.dart
pkgs/http/example/main.dart
pkgs/http_multi_server/test/cert.dart

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
cupertino_http	Non-Breaking	3.1.0	3.1.1-wip	3.1.1-wip	✔️

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API leaks ✔️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

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Unused Dependencies ⚠️

Package	Status
cupertino_http	❗ Show Issues These packages are used outside lib/ but are not dev_dependencies: * flutter * integration_test These packages are only used outside lib/ and should be downgraded to dev_dependencies: * code_assets * hooks * logging * native_toolchain_c These packages may be unused, or you may be using assets from these packages: * dart_flutter_team_lints Failed to update packages.

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Coverage ⚠️

File	Coverage
pkgs/cupertino_http/lib/src/native_cupertino_bindings.dart	💚 0 % ⬆️ 0 %
pkgs/cupertino_http/tool/ffigen.dart	💔 Not covered

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