ci: Add 'prompts' to allowed semantic PR title types

[Aaron ("AJ") Steers (aaronsteers)]

Summary

Adds prompts to the allowed types list in the amannn/action-semantic-pull-request config. This is part of a coordinated rollout across ~10 Airbyte repos introducing a dedicated semantic PR type for changes to AI/LLM prompts, agent instructions, playbooks, and skill definitions — content that doesn't fit docs, ci, feat, or fix.

Single-line addition to .github/workflows/semantic-pr-title.yml. Purely additive — no existing types removed or modified.

Review & Testing Checklist for Human

• Verify prompts is correctly indented in the YAML types list (matches sibling entries)
• After merge, confirm a test PR with prompts: ... title passes the semantic PR title check

Notes

• Companion skill definition PR: airbytehq/ai-skills#79
• Requested by: Aaron ("AJ") Steers (@aaronsteers)
• Link to Devin session

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