add explicit call of Sphinx-Config file #1626

Job	Run time
Sphinx docs check	30s
Tutorial tests (3.9, ubuntu-latest)	1m 18s
Tests (3.9, ubuntu-latest)	42s
Tutorial tests (3.9, windows-latest)	2m 15s
Linting	17s
Tests (3.9, windows-latest)	1m 14s
Tutorial tests (3.10, ubuntu-latest)	1m 20s
Tests (3.10, ubuntu-latest)	44s
Tutorial tests (3.10, windows-latest)	2m 6s
Tests (3.10, windows-latest)	1m 19s
Tutorial tests (3.11, ubuntu-latest)	1m 31s
Tests (3.11, ubuntu-latest)	1m 1s
Tutorial tests (3.11, windows-latest)	2m 38s
Tests (3.11, windows-latest)	1m 41s
Tutorial tests (3.12, ubuntu-latest)	1m 11s
Tests (3.12, ubuntu-latest)	36s
Tutorial tests (3.12, windows-latest)	2m 24s
Tests (3.12, windows-latest)	1m 20s
	24m 7s

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