Lint

Replace urljoin with string concatenation for base URL construction #1201

Job	Run time
build (3.13, ubuntu-latest, pre-push)	1m 19s
build (3.13, windows-latest, manual)	1m 8s
build (3.13, ubuntu-latest, pre-commit)	32s
build (3.13, windows-latest, pre-commit)	1m 16s
build (3.13, ubuntu-latest, manual)	32s
build (3.13, windows-latest, pre-push)	2m 27s
completion-lint	4s
	7m 18s

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