Merge branch 'dd4hep_v1.16.1' into 'master'

VERSION

containers/builder/Dockerfile

containers/builder/spack.yaml

containers/release/Dockerfile.in

spack/README.md

spack/packages/acts/README.md

spack/packages/acts/package.py

spack/packages/dawn/package.py

spack/packages/dawncut/package.py

spack/packages/dd4hep/package.py

spack/packages/dd4hep/tbb-workarounds.patch

spack/packages/dd4hep/tbb2.patch

spack/packages/fmt/package.py

spack/packages/geant4/CLHEP-10.03.03.patch

spack/packages/geant4/cxx17.patch

spack/packages/geant4/cxx17_geant4_10_0.patch

...ackages/geant4/geant4-10.4.3-cxx17-removed-features.patch

spack/packages/geant4/package.py

spack/packages/graphviz/fix-quartz-darwin.patch

spack/packages/graphviz/implicit.patch