Update dependency dio to ^5.7.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dio	dependencies	minor	^5.4.3+1 -> ^5.7.0

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Release Notes

cfug/dio (dio)

v5.7.0: dio 5.7.0

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What's new

• Graceful handling of responses with nonzero Content-Length, Content-Type json, but empty body
• Empty responses are now transformed to null

v5.6.0: dio 5.6.0

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What's new

• Supports the WASM environment. Users should upgrade the adapter with
  dart pub upgrade or flutter pub upgrade to use the WASM-supported version.

v5.5.0+1

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v5.5.0: dio 5.5.0

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What's new

• Raise the min Dart SDK version to 2.18.0.
• Add constructor for DioExceptionType.badCertificate.
• Create type alias DioMediaType for http_parser's MediaType.
• Fix the type conversion regression when using MultipartFile.fromBytes.
• Split the Web implementation to package:dio_web_adapter.
• Add FusedTransformer for improved performance when decoding JSON.
• Set FusedTransformer as the default transformer.
• Improves InterceptorState.toString().
• If the CancelToken got canceled before making requests,
  throws the exception directly rather than cut actual HTTP requests afterward.
• Catch MediaType parse exception in Transformer.isJsonMimeType.
• Improves warning logs on the Web platform.
• Improves memory allocating when using CancelToken.

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