Update refresh token buffer from 30 seconds to 60 seconds

[mansisampat]

Update refresh token buffer from 30 seconds to 60 seconds.

Testing

• Unit test added

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9c9e50c

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 (870af07) and merge commit (ac8cdf2).

Test Logs

• Base (870af07): https://github.com/firebase/firebase-js-sdk/actions/runs/18271093170
• Merge (ac8cdf2): https://github.com/firebase/firebase-js-sdk/actions/runs/18280797524

1. https://storage.googleapis.com/firebase-sdk-metric-reports/BG9JUdz88n.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (870af07) and merge commit (ac8cdf2).

Test Logs

• Base (870af07): https://github.com/firebase/firebase-js-sdk/actions/runs/18271093170
• Merge (ac8cdf2): https://github.com/firebase/firebase-js-sdk/actions/runs/18280797524

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