docs: pin version in links to external docs #651

Job	Run time
check-precommit / pre-commit	13s
check-md-links-default / markdown-link-check	21s
check-docs / make-docs (html)	2m 5s
check-docs / make-docs (doctest)	2m 22s
check-md-links-w-config / markdown-link-check	42s
check-package / init-store	3s
check-docs / make-docs (linkcheck)	2m 27s
check-package-extras / init-store	6s
check-schema-fixed / schema	12s
check-schema-latest / schema	12s
check-typing / mypy	16s
check-package / pkg-build (ubuntu-latest)	29s
check-package-extras / pkg-build (ubuntu-latest)	22s
check-schema	1s
check-package-extras / pkg-check (ubuntu-22.04, 3.10)	18s
check-package-extras / pkg-check (macos-12, 3.10)	32s
check-package-extras / pkg-check (windows-2022, 3.10)	56s
check-package / pkg-check (ubuntu-22.04, 3.8)	20s
check-package / pkg-check (ubuntu-22.04, 3.12)	25s
check-package / pkg-check (macos-12, 3.8)	38s
check-package / pkg-check (macos-12, 3.12)	42s
check-package / pkg-check (windows-2022, 3.8)	55s
check-package / pkg-check (windows-2022, 3.12)	59s
check-package-extras / pkg-guardian	1s
check-package / pkg-guardian	1s
	15m 38s

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