Update PROPOSAL to version 7.4.0

This PR updates the version of PROPOSAL to its newest release v7.4.0 (see here for the total release notes)

The changes directly relevant to CORSIKA 8 are the following:

• The Photoeffect is now included as a process. It is by default enabled. This should stabilize the simulation of the EM shower component for low energies.

• PROPOSAL now issues a warning when tables are not available and need to be created. They look like this:

  [2022-08-18 11:15:59.980] [TableCreation] [warning] Tables are not available and need to be created. They will be written to '/home/jean/CORSIKA_DATA/PROPOSAL'. This can take some minutes.

  This solves issue #522 (closed)

• Tables are now saved as .dat files instead of .txt files. This solves issue #500 (closed)

• PROPOSAL now uses a 1D interpolation tables to store the mean free path of a particle. This should significantly improve the time spent in PROPOSAL and should help solve issue #519

• The KinematicLimits of BremsElectronScreening, the parametrization used to describe bremsstrahlung for electrons and positrons, have been adapted (see this presentation by Alexander for more details). This might have an influence on the number of electromagnetic particles at low energies (< 50 MeV):

I will make some checks to investigate the changes of this PR and post them to this PR before opening it for review.