Vign basic: replace provider 'grass7' by 'grass' (anticipating QGIS 3.36) #599

Job	Run time
macOS-latest (oldrel, none)	3m 50s
macOS-latest (release, none)	3m 33s
windows-latest (oldrel, none)	6m 13s
windows-latest (release, none)	5m 15s
windows-latest (devel, none)	5m 8s
ubuntu-22.04 (release, none)	4m 55s
macOS-latest (release, macos-brew)	20m 10s
windows-latest (release, chocolatey)	16m 18s
windows-latest (release, chocolatey-ltr)	21m 39s
windows-latest (devel, chocolatey)	17m 14s
ubuntu-22.04 (release, ubuntu-nightly)	12m 33s
ubuntu-22.04 (devel, ubuntu-nightly)	43m 1s
ubuntu-22.04 (release, ubuntugis)	54s
ubuntu-22.04 (release, ubuntu)	12m 50s
ubuntu-22.04 (release [hard-deps], ubuntu)	7m 10s
ubuntu-22.04 (release, ubuntu-ltr)	10m 50s
	3h 11m 33s

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