GitHub workflows: remove spelling action #812

Job	Run time
build-current (opensuse-tumbleweed, s390x)	13s
build-current (alpine, aarch64)	12s
build-current (debian-sid, 386)	21s
build-current (alpine, s390x)	10s
build-current (debian-sid, arm/v7)	6s
build-current (opensuse-tumbleweed, 386)	6s
build-current (debian-sid, s390x)	13s
build-current (alpine, ppc64le)	11s
build-current (opensuse-tumbleweed, arm/v7)	9s
build-current (opensuse-tumbleweed, ppc64le)	10s
build-current (alpine, arm/v7)	7s
build-current (fedora-rawhide, ppc64le)	11s
build-current (alpine, 386)	20s
build-current (fedora-rawhide, s390x)	7s
build-current (debian-sid, ppc64le)	15s
	2m 51s

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