AWS Lambda Runtime Interface Client for Python v2.0.8

What's Changed

• Onboarded Python3.12 (#118)
• Fix runtime_client blocking main thread from SIGTERM being handled. Enabled by default only for Python3.12 (#115) by @tgsong (#124) by @pushkarchawda (#125) by @alex-pewpew
• Use unicode chars instead of escape sequences in json encoder output. Enabled by default only for Python3.12 (#88) by @mdsakalu (#122) by @briensea
• Cold start improvements (#121) by @alex-pewpew

Full Changelog: 2.0.7...2.0.8