chore: spack-0.20.0

spack-environment/dev/spack.yaml

@@ -17,6 +17,7 @@ spack:
     - dawn@3_91a
     - dawncut@1_54a
     - dd4hep@1.25.1 +ddg4 +ddcad -frames +hepmc3 +lcio +xercesc
+    - dpmjet@19.3.5
     - edm4eic@2.0.0 cxxstd=17
     - edm4hep@0.7 cxxstd=17
     - eic-smear@1.1.10