Disable provenance/SBOM attestations #315

Job	Run time
Build, test and push (ppc64le, py39,py311)	20m 1s
Build, test and push (s390x, py39,py310,py312)	22m 11s
Build, test and push (amd64, py36,py39,py310,py311,py312,py313,py314,py315,py314t,py315t,pypy,pyp...	4m 35s
Build, test and push (arm64, py312)	22m 43s
Update and test manifests	-1s
Update Dockerhub description	-1s
	1h 9m 28s

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