style: use type imports #735

Job	Run time
lint	52s
ensure-manifests	50s
smoke-test-cli (ubuntu-latest, 20)	59s
global-installation (ubuntu-latest, 20)	1m 4s
smoke-test-cli (macos-latest, 20)	1m 5s
global-installation (macos-latest, 20)	55s
smoke-test-cli (windows-latest, 20.12.1)	5m 13s
global-installation (windows-latest, 20.12.1)	4m 51s
test-cli (18)	1m 31s
test (18, base)	46s
test-cli (20)	1m 28s
test (18, core)	56s
type-check	1m 22s
test (18, cube)	49s
test (18, csvw)	1m 3s
test (18, formats)	49s
test (18, ftp)	55s
test (18, graph-store)	1m 11s
test (18, http)	45s
test (18, rdf)	49s
test (18, s3)	1m 3s
test (18, sparql)	48s
test (18, shacl)	46s
test (18, validation)	1m 56s
test (20, base)	45s
test (20, core)	1m 18s
test (20, cube)	49s
test (20, csvw)	47s
test (20, formats)	46s
test (20, ftp)	50s
test (20, graph-store)	1m 10s
test (20, http)	43s
test (20, rdf)	49s
test (20, s3)	53s
test (20, sparql)	47s
test (20, shacl)	53s
test (20, validation)	1m 41s
	44m 57s

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