Add missing imports to fix Swift 6.1+ #247

Job	Run time
Compatibility test	4m 38s
Unit tests / Construct unit test matrix	10s
Soundness / API breakage check	0s
Soundness / Documentation check	1m 39s
Soundness / Broken symlinks check	3s
Soundness / Format check	39s
Soundness / License headers check	5s
Soundness / Python lint check	4s
Soundness / Shell check	33s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	0s
Integration test / Linux (5.9)	2m 1s
Integration test / Linux (5.10)	1m 37s
Integration test / Windows (6.0)	3s
Integration test / Windows (nightly-6.0)	3s
Integration test / Linux (6.0)	1m 51s
Integration test / Linux (nightly-6.0)	2m 23s
Integration test / Windows (nightly-main)	1s
Integration test / Linux (nightly-main)	34s
Example packages / Linux (5.9)	17m 36s
Example packages / Windows (6.0)	2s
Example packages / Linux (5.10)	15m 45s
Example packages / Linux (6.0)	17m 51s
Example packages / Windows (nightly-6.0)	2s
Example packages / Linux (nightly-6.0)	17m 51s
Example packages / Linux (nightly-main)	32s
Example packages / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (5.9)	1m 34s
Unit tests / Unit tests / Linux (5.10)	1m 31s
Unit tests / Unit tests / Linux (6.0)	2m 17s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 4s
	1h 33m 34s

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