Swift OpenAPI URLSession 1.0.0-alpha.1

What's Changed

SemVer Major

• Move to Swift 5.9 as the minimum version by @czechboy0 in #32

SemVer Minor

• Improve inlining by @czechboy0 in #30
• Remove AsyncStream.makeStream backports now we support only Swift 5.9+ by @simonjbeaumont in #34

SemVer Patch

• Add missing available annotation to streaming tests by @simonjbeaumont in #33

Other Changes

• Prep for 1.0 alpha, adapted to runtime changes in main by @czechboy0 in #31
• Bump to 1.0.0-alpha.1 by @czechboy0 in #36

Full Changelog: 0.3.1...1.0.0-alpha.1