chore: bump gitlab-ai-provider to 6.23.1 - #58998

Issue for this PR

Closes #53831

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Bumps the pinned gitlab-ai-provider from 6.19.0 to 6.23.1 in packages/core and packages/opencode on v1. The v2 counterpart (dev, packages/core only) is #58999.

6.23.1 (latest) adds the duo-chat-haiku-5-5 and duo-workflow-haiku-5-5 (Claude Haiku 5.5) mappings and a duo-workflow-gemini-4-argon mapping. The models.dev entry for duo-chat-haiku-5-5 is still v2_only and will be published to api.json once both opencode lines ship this bump. Otherwise the model would appear in the picker and then fail with Unknown model ID.

Other provider changes since 6.19.0: Duo Agent Platform now works on self-managed instances (WebSocket namespace fallback, provider-level workflowOptions defaults), Responses API tools now default to strict: false, an Anthropic refusal stop reason maps to content-filter, and there are two new opt-in options (skipCache, shared direct-access token cache). The provider API opencode uses didn't change, so no source changes were needed.

bun.lock changes only in the two pins and the resolved package entry, plus a signal-exit re-hoist: 6.23.x adds proper-lockfile, which needs signal-exit@3.

How did you verify your code works?

• bun install (Bun 1.4.4): both packages resolve gitlab-ai-provider 6.23.1 from npm, and the installed dist/ contains the Haiku 5.5 ids.
• bun run typecheck passes in packages/core and packages/opencode.
• packages/core: bun test gives 1102 pass, 0 fail.
• packages/opencode: bun test test/provider/gitlab-duo.test.ts test/provider/provider.test.ts test/provider/transform.test.ts gives 688 pass, 0 fail.

Screenshots / recordings

Not a UI change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR