Update awscrt requirement from <=0.20.11,>=0.19.18 to >=0.19.18,<=0.20.12

[dependabot[bot]]

Updates the requirements on awscrt to permit the latest version.

Release notes

Sourced from awscrt's releases.

v0.20.12

What's Changed

• fix docs.yml by @​graebm in awslabs/aws-crt-python#568
• Address issues with latest AWS-LC and OpenBSD by @​graebm in awslabs/aws-crt-python#569
• latest submodules by @​graebm in awslabs/aws-crt-python#570

Full Changelog: https://github.com/awslabs/aws-crt-python/compare/v0.20.11...v0.20.12

Commits

• e88cce2 latest submodules (#570)
• c9c84bc Address issues with latest AWS-LC and OpenBSD (#569)
• 4a4fd22 fix docs.yml (#568)
• af29c15 Fix bug where last few bytes on socket go unread (#567)
• 23efdd7 Typing fixes (#566)
• 68afb70 Bind connack_timeout_ms for mqtt5 (#548)
• b5c7972 Treat correlation data as binary not a nullable string (#560)
• d76c3da Pass CRT error, if it exists, into completion function (#563)
• c11a554 Empty Commit to retrigger Release Pipeline (#557)
• 4ea1fd3 Latest Submodules (#554)
• Additional commits viewable in compare view

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