chore: use default values for github runners in test workflow #175

Job	Run time
rtd-docs-checks / Check for Makefile	6s
rtd-docs-checks / Check removed URLs / build-docs	46s
rtd-docs-checks / Markdown style checks / markdown-lint	25s
rtd-docs-checks / Automatic doc checks / Inclusive language check / Check for inclusive language in the documentation	48s
rtd-docs-checks / Automatic doc checks / Spell check / Check spelling in the documentation	33s
rtd-docs-checks / Automatic doc checks / Link check / Check links in the documentation	33s
rtd-docs-checks / Sphinx and Python dependency build checks / build	8m 45s
	11m 56s

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