Lint

Replace urljoin with string concatenation for base URL construction #1203

Job	Run time
build (3.13, windows-latest, manual)	1m 17s
build (3.13, ubuntu-latest, manual)	31s
build (3.13, ubuntu-latest, pre-push)	1m 18s
build (3.13, ubuntu-latest, pre-commit)	42s
build (3.13, windows-latest, pre-commit)	1m 22s
build (3.13, windows-latest, pre-push)	2m 36s
completion-lint	3s
	7m 49s

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