Bump firebase-functions ^5.1.0 → ^7.2.5. The whole codebase now uses the v2 API
(firebase-functions/v2/*) with onUserDelete explicitly on firebase-functions/v1, so the
v6/v7 removal of the root v1 namespace is a no-op for us. firebase-admin unchanged (v7 does
not peer-require a bump).
The plan assumed v6 was latest; the actual latest is v7.2.5 (v7 released after the plan was
written). Verified under v7: tsc clean, 70 tests green, emulator discovery loads all 33
functions in us-central1 with zero errors and the "outdated firebase-functions" warning gone
(v6.6.0 still tripped that warning).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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