Replace pub run with dart run

[sigurdm]

Following up on dart-lang/pub#4737, this PR replaces deprecated pub run commands with dart run.

[github-actions]

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// 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/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	Breaking	2.4.0	3.0.0-wip	3.0.0	✔️

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