[FEATURE]: Bump gitlab-ai-provider to 6.11.0 (adds GPT-5.6 Sol/Terra/Luna) #36666

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Describe the enhancement you want to request

gitlab-ai-provider 6.11.0 has been published to npm. It adds the GPT-5.6 model mappings (duo-chat-gpt-5-6-sol, duo-chat-gpt-5-6-terra, duo-chat-gpt-5-6-luna), which lets opencode's GitLab provider surface all three GPT-5.6 variants in the model picker.

opencode currently pins gitlab-ai-provider at 6.10.0 in packages/core/package.json and packages/opencode/package.json. This request is to bump both to 6.11.0 so the new models are available.

Benefit: GitLab Duo users get access to GPT-5.6 Sol (flagship), Terra (balanced), and Luna (fast/cost-efficient) — each with a 1,050,000 token context window and 128k output — through opencode without any further code changes; the provider already exposes the mappings, opencode just needs the dependency bump.