spack: use upstream `acts` (conditional variants) when spack version > Nov 3, 2021
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ensure spack version > Nov 3, 2021, 67cd92e6a32a1962f1cfde331a509ea968ac246e -
remove local spack/packages/acts
In general the upstream acts is seeing a bunch of changes, including autodiff, vecmem, sycl support. Some of those pull in additional dependencies and might be long shots for us.