Update dependency @ckeditor/ckeditor5-dev-utils to v43 #10

Job	Run time
Check that documentation for configuration steps is up-to-date	2m 34s
Build and check documentation	2m 25s
End-to-end tests, chromium	1m 44s
Run the Django test suite (main)	1m 36s
End-to-end tests, firefox	1m 46s
Run the Django test suite (elastic)	1m 41s
End-to-end tests, webkit	1m 41s
Run the Django test suite (openklant)	1m 33s
End-to-end tests, msedge	1m 46s
Upload coverage information to codecov	0s
Build (and push) Docker image	0s
	16m 46s

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