chore(deps): update google-github-actions/auth digest to fc21748

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google-github-actions/auth	action	digest	c4799db -> fc21748

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[changeset-bot]

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Latest commit: 9aeb5aa

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (0800a8b) and merge commit (f2d7f47).

Test Logs

• Base (0800a8b): https://github.com/firebase/firebase-js-sdk/actions/runs/19113232593
• Merge (f2d7f47): https://github.com/firebase/firebase-js-sdk/actions/runs/19244137876

1. https://storage.googleapis.com/firebase-sdk-metric-reports/Bfo9m48qCz.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (0800a8b) and merge commit (f2d7f47).

Test Logs

• Base (0800a8b): https://github.com/firebase/firebase-js-sdk/actions/runs/19113232593
• Merge (f2d7f47): https://github.com/firebase/firebase-js-sdk/actions/runs/19244137876

1. https://storage.googleapis.com/firebase-sdk-metric-reports/QNblVl9REw.html