[core] Only one `LambdaRuntime.run()` can be called at a time (fix #507) #555

Job	Run time
Semantic Version label check	4s
musl	1m 36s
Unit tests / Construct unit test matrix	5s
Integration Tests / Test Examples/APIGateway on	1m 53s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	1m 50s
Integration Tests / Test Examples/BackgroundTasks on	1m 44s
Integration Tests / Test Examples/HelloJSON on	1m 41s
Integration Tests / Test Examples/HelloWorld on	1m 43s
Integration Tests / Test Examples/ResourcesPackaging on	1m 43s
Integration Tests / Test Examples/S3EventNotifier on	1m 57s
Integration Tests / Test Examples/S3_AWSSDK on	5m 7s
Integration Tests / Test Examples/S3_Soto on	6m 47s
Integration Tests / Test Examples/Streaming on	1m 42s
Integration Tests / Test Examples/Testing on	1m 48s
Integration Tests / Test Examples/Tutorial on	1m 44s
Integration Tests / Test archive plugin (HelloWorld)	2m 33s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 23s
Integration Tests / No dependencies on Foundation	2m 6s
Swift 6 Language Mode / Swift 6 language mode	1m 17s
Soundness / API breakage check	1m 31s
Soundness / Documentation check	1m 36s
Soundness / Broken symlinks check	5s
Soundness / Format check	35s
Soundness / License headers check	3s
Soundness / Python lint check	6s
Soundness / Shell check	36s
Soundness / Unacceptable language check	5s
Soundness / YAML lint check	6s
Unit tests / Unit tests / Linux (6.0)	1m 31s
Unit tests / Unit tests / Linux (nightly-next)	1m 35s
Unit tests / Unit tests / Linux (nightly-main)	3m 1s
	50m 33s

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