Drop availability checks for macOS 10.13 #13

Job	Run time
Validate Format Config	6s
Test / Linux (5.8 - jammy)	57s
Test / Linux (5.9 - jammy)	59s
Test / Windows (6.0 - windows-2022)	15m 59s
Test / Linux (5.10 - jammy)	1m 8s
Test / Windows (nightly - windows-2019)	12m 20s
Test / Linux (6.0 - jammy)	1m 15s
Test / Windows (nightly-6.1 - windows-2019)	12m 48s
Test / Linux (nightly-main - jammy)	1m 30s
Test / Linux (nightly-6.1 - jammy)	1m 38s
Soundness / API breakage check	2s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	1s
Soundness / Format check	4s
Soundness / License headers check	0s
Soundness / Python lint check	2s
Soundness / Shell check	0s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	1s
	48m 55s

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