Add berkeleygw 4 to gcc 14 toolchain

toolchains/gcc-14_2-openmpi-5_0_5/spack.yaml.jinja

@@ -33,6 +33,7 @@ spack:
     - elpa@2024.03.001+openmp
     - elpa@2024.03.001~openmp
     - libvdwxc@0.4.0+mpi+pfft
+    - berkeleygw@3.1.0+mpi
     - berkeleygw@4.0+mpi
     - parmetis@4.0.3+int64
     - pfft@1.0.8-alpha

toolchains/gcc-14_2/spack.yaml.jinja

@@ -21,6 +21,7 @@ spack:
     - libgd@2.3.3
     - libvdwxc@0.4.0~~mpi
     - nfft@3.5.3
+    - berkeleygw@3.1.0~~mpi
     - berkeleygw@4.0~~mpi
     - python@3.11.7  # python 3.12 not yet supported by cython
     - cgal@6.0.1