chore: renumber BoM 5.0.0 to 4.19.0

[Lyokone]

BoM 5.0.0 → 4.19.0

Renumbers the 2026-08-24 BoM entry. The 17 package pins are unchanged and match what was published to pub.dev.

generate_bom.dart bumps the BoM major whenever any tracked package goes major, so firebase_ai 3.15.0 → 4.0.0 alone took the BoM 4.18.0 → 5.0.0. The remaining 16 packages were 10 minor and 6 patch.

Changes

File	Change
scripts/versions.json	top-level key 5.0.0 → 4.19.0
VERSIONS.md	entry heading and flutterfire install command
CHANGELOG.md	entry heading and VERSIONS.md anchor

Tags

BoM-v5.0.0 is superseded and needs deleting; BoM-v4.19.0 replaces it. The 45 package tags are unaffected.

Note

firebase_ai 4.0.0 remains in this BoM, so 4.19.0 does contain a breaking package change.

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