fix(deps): update dependency http to ^0.13.0 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
http	dependencies	minor	^0.12.1 -> ^0.13.0

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Release Notes

dart-lang/http

v0.13.5

• Allow async callbacks in RetryClient.
• In MockHttpClient use the callback returned Response.request instead of
  the argument value to give more control to the callback. This may be breaking
  for callbacks which return incomplete Responses and relied on the default.

v0.13.4

Compare Source

• Throw a more useful error when a client is used after it has been closed.
• Require Dart 2.14.

v0.13.3

Compare Source

• Validate that the method parameter of BaseRequest is a valid "token".

v0.13.2

• Add package:http/retry.dart with RetryClient. This is the same
  implementation as package:http_retry which will be discontinued.

v0.13.1

• Fix code samples in README to pass a Uri instance.

v0.13.0

Compare Source

• Migrate to null safety.
• Add const constructor to ByteStream.
• Migrate BrowserClient from blob to arraybuffer.
• Breaking All APIs which previously allowed a String or Uri to be
  passed now require a Uri.
• Breaking Added a body and encoding argument to Client.delete. This
  is only breaking for implementations which override that method.

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