chore(deps): update dependency firebase_core_platform_interface to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
firebase_core_platform_interface (source)	dev_dependencies	major	^5.4.0 -> ^6.0.0

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Release Notes

firebase/flutterfire (firebase_core_platform_interface)

v6.0.2

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• FIX: a bug with the demoProjectId arg to Firebase.initializeApp() (#​17703). (09d03aac)

v6.0.1

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• DOCS(firebase_core): correct androidClientId docs (was incorrectly labeled iOS-only)\n\n- Clarify as Android OAuth client ID\n- Note it is used on Android only\n\nFixes firebase/flutterfire#​13519 (#​17720). (0b6b13d0)

v6.0.0

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