bump `py3.8` and Ruff cleaning #632

Job	Run time
check-docs / make-docs (html)	1m 56s
check-md-links-w-config / markdown-link-check	18s
check-docs / make-docs (doctest)	1m 42s
check-docs / make-docs (linkcheck)	2m 37s
check-md-links-default / markdown-link-check	17s
check-package / init-store	3s
check-precommit / pre-commit	43s
check-package-extras / init-store	3s
check-schema-fixed / schema	12s
check-schema-latest / schema	11s
check-typing / mypy	14s
check-package-extras / pkg-build (ubuntu-latest)	20s
check-package / pkg-build (ubuntu-latest)	20s
check-schema	1s
check-package / pkg-check (ubuntu-22.04, 3.8)	14s
check-package / pkg-check (ubuntu-22.04, 3.12)	20s
check-package / pkg-check (macos-12, 3.8)	25s
check-package / pkg-check (macos-12, 3.12)	24s
check-package / pkg-check (windows-2022, 3.8)	49s
check-package / pkg-check (windows-2022, 3.12)	44s
check-package-extras / pkg-check (ubuntu-22.04, 3.10)	20s
check-package-extras / pkg-check (macos-12, 3.10)	30s
check-package-extras / pkg-check (windows-2022, 3.10)	51s
check-package / pkg-guardian	1s
check-package-extras / pkg-guardian	1s
	13m 36s

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