feat: upgrade lambda runtime from 18x to 20x (#3682) #4773

Job	Run time
Verify module (1.5.6)	1m 23s
Verify examples (1.5.6, default)	23s
Verify module (latest)	17s
Verify modules (1.3.2, ami-housekeeper)	24s
Verify examples (1.5.6, ubuntu)	24s
Verify modules (1.3.2, download-lambda)	15s
Verify examples (1.5.6, prebuilt)	37s
Verify modules (1.3.2, multi-runner)	34s
Verify examples (1.5.6, arm64)	36s
Verify modules (1.3.2, runner-binaries-syncer)	56s
Verify examples (1.5.6, ephemeral)	18s
Verify modules (1.3.2, runners)	29s
Verify examples (1.5.6, windows)	24s
Verify modules (1.3.2, setup-iam-permissions)	30s
Verify examples (1.5.6, multi-runner)	17s
Verify modules (1.3.2, ssm)	58s
Verify examples (latest, default)	13s
Verify modules (1.3.2, webhook)	44s
Verify examples (latest, ubuntu)	10s
Verify modules (latest, ami-housekeeper)	26s
Verify examples (latest, prebuilt)	26s
Verify modules (latest, download-lambda)	10s
Verify examples (latest, arm64)	22s
Verify modules (latest, multi-runner)	35s
Verify examples (latest, ephemeral)	11s
Verify modules (latest, runner-binaries-syncer)	28s
Verify examples (latest, windows)	23s
Verify modules (latest, runners)	14s
Verify examples (latest, multi-runner)	33s
Verify modules (latest, setup-iam-permissions)	16s
Verify modules (latest, ssm)	16s
Verify modules (latest, webhook)	14s
	14m 26s

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