fix(platform-serverless): fix compilation issue on ServerlessContext #8057

Job	Run time
test-core (18.17.1)	2m 15s
test-graphql (18.17.1)	2m 18s
lint (18.17.1)	1m 57s
test-formio (18.17.1)	2m 16s
test-integration (ubuntu-latest, 18.17.1)	2m 15s
test-orm (18.17.1)	2m 16s
test-integration (ubuntu-latest, 20.x)	2m 8s
test-platform (18.17.1)	2m 16s
test-security (18.17.1)	2m 16s
test-specs (18.17.1)	2m 15s
test-third-parties (18.17.1)	2m 10s
deploy-packages	0s
	24m 22s

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