Update dependency firebase_storage to v12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
firebase_storage (source)	dependencies	major	^11.0.0 -> ^12.0.0

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Release Notes

firebase/flutterfire (firebase_storage)

v12.3.4

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• FIX(storage,android): stream handler & event channel clean up on completion (#​13508). (f010b468)

v12.3.3

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• FIX(storage,web): fix putData when using UInt8List (#​13466). (2bfb549e)

v12.3.2

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• FIX(all,apple): use modular headers to import (#​13400). (d7d2d4b9)

v12.3.1

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• Update a dependency to the latest release.

v12.3.0

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• FEAT(web): update to web: ^1.0.0 (#​13200). (8fab04ae)

v12.2.0

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• FEAT: bump iOS SDK to version 11.0.0 (#​13158). (c0e0c997)
• DOCS: remove reference to flutter.io and firebase.flutter.dev (#​13152). (5f0874b9)

v12.1.3

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• FIX(storage,windows): add log to explain that the Storage Emulator is not available on Windows (#​13147). (8d1ea80c)

v12.1.2

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• Update a dependency to the latest release.

v12.1.1

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• Update a dependency to the latest release.

v12.1.0

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• FEAT(storage,windows): add support for creationTime and updateTime (#​12966). (70a3fbc9)

v12.0.1

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• Update a dependency to the latest release.

v12.0.0

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Note: This release has breaking changes.

• BREAKING REFACTOR: android plugins require minSdk 21, auth requires minSdk 23 ahead of android BOM >=33.0.0 (#​12873). (52accfc6)
• BREAKING REFACTOR: bump all iOS deployment targets to iOS 13 ahead of Firebase iOS SDK v11 breaking change (#​12872). (de0cea2c)
• BREAKING REFACTOR(storage): remove deprecated API ahead of breaking change (#​12863). (aaf01ac5)

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