aws-c-http 0.9.6

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

## What's Changed
* Fix Error Handling For Connection Manager by @waahm7 in https://github.com/awslabs/aws-c-http/pull/507
* h1_decoder error on multiple content-length headers by @quinnj in https://github.com/awslabs/aws-c-http/pull/509
* Apple Network Framework Support by @xiazhvera in https://github.com/awslabs/aws-c-http/pull/502
New Contributors

@xiazhvera made their first contribution in Apple Network Framework Support awslabs/aws-c-http#502

Full Changelog: awslabs/aws-c-http@v0.9.5...v0.9.6

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