Lint

Replace urljoin with string concatenation for base URL construction #1206

Job	Run time
build (3.13, windows-latest, pre-push)	2m 26s
build (3.13, windows-latest, pre-commit)	1m 17s
build (3.13, ubuntu-latest, pre-commit)	37s
build (3.13, ubuntu-latest, manual)	30s
build (3.13, windows-latest, manual)	1m 33s
build (3.13, ubuntu-latest, pre-push)	1m 9s
completion-lint	2s
	7m 34s

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