Drop support for Swift 5.9 #145

Job	Run time
Cxx interop / Construct Cxx interop matrix	5s
Unit tests / Construct unit test matrix	4s
Soundness / API breakage check	4m 27s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	2m 59s
Soundness / Format check	34s
Soundness / License headers check	3s
Soundness / Shell check	30s
Soundness / Python lint check	7s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	4s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 37s
Static SDK / Static SDK / Linux (main Jammy)	1m 58s
Unit tests / Unit tests / Linux (5.10)	5m 1s
Unit tests / Unit tests / Linux (6.0)	5m 33s
Unit tests / Unit tests / Linux (6.1)	5m 17s
Unit tests / Unit tests / Linux (nightly-next)	6m 3s
Unit tests / Unit tests / Linux (nightly-main)	6m 15s
Cxx interop / Cxx interop / Linux (5.10)	2m 35s
Cxx interop / Cxx interop / Linux (6.0)	2m 53s
Cxx interop / Cxx interop / Linux (6.1)	2m 58s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 27s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 50s
	58m 25s

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