Disable provenance/SBOM attestations #316

Job	Run time
Build, test and push (ppc64le, py39,py311)	21m 17s
Build, test and push (arm64, py312)	22m 4s
Build, test and push (amd64, py36,py39,py310,py311,py312,py313,py314,py315,py314t,py315t,pypy,pyp...	4m 40s
Build, test and push (s390x, py39,py310,py312)	22m 16s
Update and test manifests	0s
Update Dockerhub description	0s
	1h 10m 17s

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