fix(deps): update dependency appwrite to v20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
appwrite (source)	dependencies	major	^16.0.0 → 20.3.3

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Release Notes

appwrite/sdk-for-flutter (appwrite)

v20.3.3

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• Fix boolean parameter not handled correctly in Client requests

v20.3.2

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• Fix OAuth2 browser infinite redirect issue

v20.3.1

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• Fix passing of null values and stripping only non-nullable optional parameters from the request body
• Add getScreenshot method to Avatars service
• Add Theme, Timezone and Output enums

v20.3.0

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• Add total parameter to list queries allowing skipping counting rows in a table for improved performance
• Add Operator class for atomic modification of rows via update, bulk update, upsert, and bulk upsert operations

v20.2.2

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• Widen device_info_plus and package_info_plus dependencies to allow for newer versions for Android 15+ support
• Fix CHUNK_SIZE constant to chunkSize
• Fix missing @override annotation to toMap method in all model classes

v20.2.1

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• Add transaction support for Databases and TablesDB

v20.1.0

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• Deprecate createVerification method in Account service
• Add createEmailVerification method in Account service

v20.0.0

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What's Changed

• feat: Flutter SDK update for version 20.0.0 by @​ChiragAgg5k in #​274, introduces support of enums in response models.

Full Changelog: appwrite/sdk-for-flutter@19.1.0...20.0.0

v19.1.0

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• Add orderRandom query support

v19.0.0

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• Rename CreditCard enum value unionChinaPay to unionPay
• Add time between query support
• Add spatial query support

v18.0.0

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• Support for Appwrite 1.8
• Added TablesDB service
• Added new query types:
  • notContains
  • notSearch
  • notBetween
  • notStartsWith
  • notEndsWith
  • createdBefore
  • createdAfter
  • updatedBefore
  • updatedAfter
• Deprecated updateMagicURLSession
• Deprecated updatePhoneSession
• Deprecated Databases service

The TablesDB service is the new recommended way to work with databases.
Existing databases/collections/attributes/documents can be managed using the TablesDB service.
Existing Databases service will continue to work, but new features may only be added to the TablesDB service.

v17.1.0

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• Add incrementDocumentAttribute and decrementDocumentAttribute support to Databases service
• Add gif support to ImageFormat enum
• Add sequence support to Document model

v17.0.2

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• Add gif support to ImageFormat enum
• Fix convertTo() method in Document and Preferences models to correctly accept Map<String, dynamic>

v17.0.1

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• Fix devKeys support by conditionally including credentials during requests

v17.0.0

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• Update flutter_web_auth_2 dependency to version 4.1.0
• Update auth.html example in README.md to align with flutter_web_auth_2 documentation
• Breaking changes:
  • Minimum iOS version supported is now 17.4 due to the updated requirements of flutter_web_auth_2 version 4.1.0

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