chore(deps): bump http from 0.13.4 to 0.13.6

[dependabot[bot]]

Bumps http from 0.13.4 to 0.13.6.

Commits

• f581ff7 Prepare to publish (#914)
• fa53651 Document that RetryClient may consume a lot of memory (#915)
• ffb4438 Fix maxRedirects documentation to mention ClientException rather than Redirec...
• ad0e1cf Fix some spelling (#885)
• 74f9d3d Add conformances test that verify that the Client works in Isolates (#889)
• ee03604 Add a flag to allow the default Client to be tree shaken away. (#868)
• 2039fb3 Fix a reference count race with forwarded delegates. (#888)
• 805a147 Fix some spelling (#884)
• 5a2f036 Move to pkg:dart_flutter_team_lints, require Dart 2.19 (#883)
• 35b2cef Corrected the spelling of "Implements" in "/http/lib/src/io_client.dart" (#871)
• Additional commits viewable in compare view

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