Drop support for Swift 5.8 from Linux workflows #119

Job	Run time
Test without Docker / Linux (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test without Docker / Windows (5.9 - windows-2022)	4m 35s
Test with Docker / Windows (5.9 - windows-2022)	10m 10s
Test without Docker / Windows (6.0 - windows-2022)	5m 49s
Test with Docker / Linux (5.9 - jammy)	28s
Test with Docker / Windows (6.0 - windows-2022)	13m 11s
Test without Docker / Windows (nightly - windows-2022)	5m 19s
Test with Docker / Linux (5.10 - jammy)	26s
Test with Docker / Windows (nightly - windows-2019)	10m 13s
Test without Docker / Windows (nightly-6.1 - windows-2022)	5m 14s
Test with Docker / Windows (nightly-6.1 - windows-2019)	8m 23s
Test with Docker / Linux (6.0 - jammy)	31s
Test with Docker / Linux (nightly-main - jammy)	38s
Test with Docker / Linux (nightly-6.1 - jammy)	33s
Soundness / Broken symlinks check	2s
Soundness / API breakage check	0s
Soundness / Documentation check	36s
Soundness / Format check	0s
Soundness / License headers check	2s
Soundness / Python lint check	5s
Soundness / Shell check	37s
Soundness / Unacceptable language check	5s
Soundness / YAML lint check	3s
	1h 7m 0s

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