chore(deps): update dependency http to v1.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
http (source)	dev_dependencies	minor	^1.5.0 → 1.6.0

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Release Notes

dart-lang/http (http)

v1.6.0

• Breaking Change the behavior of Request.body so that a charset
  parameter is only added for text and XML media types. This brings the
  behavior of package:http in line with RFC-8259.
• On the web, fix cancellations for StreamSubscriptions of response bodies
  waiting for the next chunk.
• Export MediaType from package:http_parser.
• Added a section on testing to README.md.

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