reduce platforms dependencies #24

Job	Run time
License headers check	3s
Soundness / Unacceptable language check	2s
Soundness / Documentation check	1m 42s
Soundness / API breakage check	2m 14s
Soundness / Format check	52s
Soundness / Broken symlinks check	5s
Soundness / License headers check	0s
Soundness / YAML lint check	2s
Soundness / Python lint check	0s
Soundness / Shell check	0s
Swift 6 Language Mode / Swift 6 language mode	1m 28s
Unit tests / Unit tests / Linux (5.9)	24s
Unit tests / Unit tests / Linux (5.10)	1m 43s
Unit tests / Unit tests / Linux (6.0)	2m 2s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 13s
Unit tests / Unit tests / Linux (nightly-main)	2m 36s
	15m 26s

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