Fix changeset checker logic

[hsubox76]

Blocking flag should only be set if firebase bump is mismatched or missing.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1f83c77

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.

This PR includes no changesets

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[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (09e8249) and head commit (2a40fdc).

Test Logs

• Base (09e8249e): https://github.com/firebase/firebase-js-sdk/actions/runs/535332457
• Head (2a40fdc5): https://github.com/firebase/firebase-js-sdk/actions/runs/535370473

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (09e8249) and head commit (2a40fdc).

Test Logs

• Base (09e8249): https://github.com/firebase/firebase-js-sdk/actions/runs/535332457
• Head (2a40fdc): https://github.com/firebase/firebase-js-sdk/actions/runs/535370473