Disable provenance/SBOM attestations #321

Job	Run time
Build, test and push (arm64, py312)	1m 57s
Build, test and push (amd64, py36,py39,py310,py311,py312,py313,py314,py315,py314t,py315t,pypy,pyp...	1m 55s
Build, test and push (ppc64le, py39,py311)	1m 57s
Build, test and push (s390x, py39,py310,py312)	2m 0s
Update and test manifests	0s
Update Dockerhub description	0s
	7m 49s

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