Drop support for Swift 5.9 #112

Job	Run time
Cxx interop / Construct Cxx interop matrix	4s
Unit tests / Construct unit test matrix	4s
Soundness / API breakage check	4m 17s
Soundness / Documentation check	2m 49s
Soundness / Broken symlinks check	4s
Soundness / Format check	34s
Soundness / License headers check	6s
Soundness / Unacceptable language check	4s
Soundness / Shell check	31s
Soundness / YAML lint check	5s
Soundness / Python lint check	5s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 23s
Static SDK / Static SDK / Linux (main Jammy)	1m 53s
Unit tests / Unit tests / Linux (5.10)	4m 49s
Unit tests / Unit tests / Linux (6.0)	5m 11s
Unit tests / Unit tests / Linux (6.1)	5m 4s
Unit tests / Unit tests / Linux (nightly-next)	5m 39s
Unit tests / Unit tests / Linux (nightly-main)	5m 56s
Cxx interop / Cxx interop / Linux (5.10)	2m 29s
Cxx interop / Cxx interop / Linux (6.0)	2m 56s
Cxx interop / Cxx interop / Linux (6.1)	2m 52s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 31s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 36s
	56m 2s

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