build(deps): Bump firebase_core from 3.0.0 to 3.1.1 in /example

[dependabot[bot]]

Bumps firebase_core from 3.0.0 to 3.1.1.

Commits

• e2aaba3 chore(release): publish packages
• a100829 fix(auth, windows): fix a crash that could happen when using `sendEmailVerifi...
• 747b0b6 chore(release): publish packages (#12942)
• c1a67e5 fix(firestore, web): ensure streams are removed on "hot restart" (#12913)
• a224a02 chore(all): migrate example web directories to new structure (#12911)
• 1333f4a chore: topics for all FlutterFire plugins in pubspec.yaml files (#12841)
• 859ec1d feat: add support for demo project (#11973)
• 1b33533 chore(release): publish packages + BoM 2.0.0 (#12895)
• See full diff in compare view

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