Update merge release branch workflow trigger

[hsubox76]

Oops, should be workflow_dispatch to allow triggering from Github UI.

[changeset-bot]

⚠️ No Changeset found

Latest commit: d9858ab

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 (74ac9b0) and merge commit (a585d1a).

Test Logs

• Base (74ac9b0): https://github.com/firebase/firebase-js-sdk/actions/runs/2283855004
• Merge (a585d1a): https://github.com/firebase/firebase-js-sdk/actions/runs/2283983645

1. https://storage.googleapis.com/firebase-sdk-metric-reports/gWLgx6JE0l.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (74ac9b0) and merge commit (a585d1a).

Test Logs

• Base (74ac9b0): https://github.com/firebase/firebase-js-sdk/actions/runs/2283855004
• Merge (a585d1a): https://github.com/firebase/firebase-js-sdk/actions/runs/2283983645

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