Revert "Take out version checks"

This reverts commit b22e4b3.

Author: franzpoeschel

.github/workflows/linux.yml

@@ -183,6 +183,9 @@ jobs:
         eval $(spack env activate --sh .github/ci/spack-envs/gcc13_py312_mpich_h5_ad2/)
         spack install
 
+        mpiexec --version
+        mpicxx --version
+
         share/openPMD/download_samples.sh build
         cmake -S . -B build \
           -DopenPMD_USE_PYTHON=OFF \