fix(ci): Set git config in prerelease.yml

[ncooke3]

Missed in previous #15227. Hoping to address one part of #15235

Testing in-progress: https://github.com/firebase/firebase-ios-sdk/actions/runs/17132058863

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[paulb777]

LGTM on good ci

[ncooke3]

The manual trigger failed due to MLModelDownloader issue that is being resolved in another PR. The buildup_SpecsTesting_repo_FirebaseCore job succeeded though which is what this PR sought to fix. Merging.