test(ai): upgrade mock responses to v15

[dlarocque]

Upgrade mock responses to v15.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6e5c8d3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (c8263c4) and merge commit (1d000bd).

Test Logs

• Base (c8263c4): https://github.com/firebase/firebase-js-sdk/actions/runs/18568308300
• Merge (1d000bd): https://github.com/firebase/firebase-js-sdk/actions/runs/18595745862

1. https://storage.googleapis.com/firebase-sdk-metric-reports/ZdbVK2dh46.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (c8263c4) and merge commit (1d000bd).

Test Logs

• Base (c8263c4): https://github.com/firebase/firebase-js-sdk/actions/runs/18568308300
• Merge (1d000bd): https://github.com/firebase/firebase-js-sdk/actions/runs/18595745862

1. https://storage.googleapis.com/firebase-sdk-metric-reports/xmubDGYaEo.html