Add support for OpenAPI 3.0.4 and 3.1.1 #154

Job	Run time
Compatibility test	5m 1s
Swift 6 Language Mode	0s
Example packages / Windows (6.0)	1s
Example packages / Linux (5.9)	17m 35s
Example packages / Linux (5.10)	15m 20s
Example packages / Linux (6.0)	17m 22s
Example packages / Linux (nightly-6.0)	21m 55s
Example packages / Windows (nightly-6.0)	2s
Example packages / Linux (nightly-main)	32s
Integration test / Linux (5.9)	1m 34s
Example packages / Windows (nightly-main)	1s
Integration test / Linux (5.10)	1m 28s
Integration test / Linux (6.0)	1m 44s
Integration test / Windows (6.0)	1s
Integration test / Windows (nightly-6.0)	2s
Integration test / Linux (nightly-6.0)	2m 5s
Integration test / Windows (nightly-main)	1s
Soundness / Documentation check	1m 34s
Integration test / Linux (nightly-main)	32s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	5s
Soundness / Format check	38s
Soundness / Python lint check	5s
Soundness / License headers check	4s
Soundness / Shell check	38s
Soundness / Unacceptable language check	6s
Soundness / YAML lint check	0s
Unit tests / Unit tests / Linux (5.9)	1m 40s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (5.10)	1m 34s
Unit tests / Unit tests / Linux (6.0)	1m 45s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 5s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Linux (nightly-main)	31s
Unit tests / Unit tests / Windows (nightly-main)	3s
	1h 36m 9s

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