Firebase Admin Go SDK v4.15.0

New Features

• feat(fcm): enable direct_boot_ok as bool in Android config (#638)

Bug Fixes

• fix(fcm): Change DirectBootOK per Go initialisms (#645)

Miscellaneous

• [chore] Release 4.15.0 (#649)
• chore: Add X-Goog-Api-Client header to Auth and FCM requests (#648)
• chore: Upgrade Go version support (#647)
• chore: Skip integration tests for deprecated FCM APIs (#646)
• chore: update integration test resources (#633)