[Auth] Fix a type error in one of our tests

[sam-gc]

No description provided.

[changeset-bot]

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Latest commit: addb6d9

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[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (b6a7a59) and head commit (a2fb9e0).

Test Logs

• Base (b6a7a598): https://github.com/firebase/firebase-js-sdk/actions/runs/647164828
• Head (a2fb9e02): https://github.com/firebase/firebase-js-sdk/actions/runs/647166746

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (b6a7a59) and head commit (a2fb9e0).

Test Logs

• Base (b6a7a59): https://github.com/firebase/firebase-js-sdk/actions/runs/647164828
• Head (a2fb9e0): https://github.com/firebase/firebase-js-sdk/actions/runs/647166746

[yuchenshi]

This all looks magical top me but I trust that you know what you're doing.

[sam-gc]

I think the compiler just got stricter in a recent TS version bump or something