add tests on Ordered Multiple/Collection with rdflib v2.3.8 #1750

Job	Run time
build (22)	1m 51s
build (24)	1m 38s
npm-publish-dev / prerelease-check	7s
Dependabot	0s
gh-pages	-1s
npm-publish-latest	-1s
github-release	-1s
npm-publish-dev / npm-publish-build	-1s
	3m 32s

Provide feedback