fix(providers): restore zhipuai-coding-plan glm-5.3-highspeed (tier-gated, still served) - #7333

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target