Lint

Replace urljoin with string concatenation for base URL construction #1200

Job	Run time
build (3.13, windows-latest, pre-commit)	1m 20s
build (3.13, ubuntu-latest, manual)	36s
build (3.13, windows-latest, pre-push)	2m 36s
build (3.13, windows-latest, manual)	1m 30s
build (3.13, ubuntu-latest, pre-commit)	32s
build (3.13, ubuntu-latest, pre-push)	1m 14s
completion-lint	3s
	7m 51s

Provide feedback