build

Update sphinx-issues requirement from <6 to <7 #1775

Job	Run time
ensure-catalog-matches-hook-config	19s
test-sdist	1m 10s
Self-Check	11s
'mypy' on py3.x	16s
'py-mindeps' on py3.10	39s
'twine-check' on py3.x	26s
'check-sdist' on py3.x	13s
Test on ubuntu, py3.14	1m 8s
Test on ubuntu, py3.11	2m 10s
Test on ubuntu, py3.10	2m 23s
Test on windows, py3.11	3m 20s
Test on macos, py3.11	2m 6s
Test on windows, py3.10	3m 13s
Test on macos, py3.12	1m 17s
Test on macos, py3.14	58s
Test on ubuntu, py3.12	2m 5s
Test on macos, py3.10	2m 11s
Test on ubuntu, py3.13	2m 26s
Test on windows, py3.14	2m 2s
Test on windows, py3.12	3m 6s
Test on macos, py3.13	1m 44s
Test on windows, py3.13	3m 29s
Collate results to check for skipped tests	5s
	36m 57s

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