ci: upgrade GitHub Actions to supported node24 runtimes

[Zeno-sole]

Upgraded actions/checkout to v5 in auto-create-repo.yml and ymllint.yml, actions/setup-node to v5, and actions/github-script to v8 to run on the current runner's node24 runtime Removed the fork pull request head ref from the pull_request_target checkout in auto-create-repo.yml to fix the fork checkout refusal and avoid executing untrusted fork code with repository secrets

Log: Upgrade deprecated GitHub Actions and fix pull_request_target fork checkout refusal

Influence:

1. Verify auto-create-repo workflow runs successfully on merged PRs
2. Verify the merge flow still creates GitHub repos and OBS packages
3. Verify no fork PR code is checked out in pull_request_target context
4. Verify ymllint workflow validates YAML on PRs

ci: 升级 GitHub Actions 至受支持的 node24 运行时

将 auto-create-repo.yml 和 ymllint.yml 中的 actions/checkout 升级到 v5， actions/setup-node 升级到 v5，actions/github-script 升级到 v8， 以适配当前 runner 默认的 node24 运行时
移除 auto-create-repo.yml 中 pull_request_target 检出的 fork PR head ref， 修复 fork 检出被拒绝的错误，避免在携带 secrets 的受信环境中执行不可信代码

Log: 升级废弃的 GitHub Actions 并修复 pull_request_target fork 检出报错

Influence:

1. 验证 PR 合并后 auto-create-repo 工作流正常运行
2. 验证 PR 合并流程仍能正常创建 GitHub 仓库和 OBS 包
3. 验证 pull_request_target 上下文不再检出 fork PR 代码
4. 验证 ymllint 工作流在 PR 上正常运行并校验 YAML

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