fix: ensure stream is finished #768

Job	Run time
lint	55s
smoke-test-cli (ubuntu-latest, 20)	1m 4s
global-installation (ubuntu-latest, 20)	2m 25s
ensure-manifests	45s
smoke-test-cli (macos-latest, 20)	54s
global-installation (macos-latest, 20)	2m 8s
smoke-test-cli (windows-latest, 20.12.1)	4m 8s
global-installation (windows-latest, 20.12.1)	11m 4s
test-cli (18)	3m 43s
test-e2e	46s
test (18, base)	52s
type-check	1m 26s
test-cli (20)	3m 54s
test (18, core)	1m 3s
test (18, cube)	1m 33s
test (18, csvw)	52s
test (18, formats)	52s
test (18, ftp)	1m 5s
test (18, graph-store)	1m 16s
test (18, http)	52s
test (18, rdf)	52s
test (18, s3)	50s
test (18, sparql)	47s
test (18, shacl)	51s
test (18, validation)	1m 54s
test (20, base)	45s
test (20, core)	52s
test (20, cube)	1m 21s
test (20, csvw)	47s
test (20, formats)	45s
test (20, ftp)	1m 3s
test (20, graph-store)	1m 12s
test (20, http)	47s
test (20, rdf)	46s
test (20, s3)	47s
test (20, sparql)	44s
test (20, shacl)	50s
test (20, validation)	1m 39s
	59m 9s

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