Merge branch 'fix-average_beta' into 'develop'

.gitlab-ci.yml

mbtrack2/impedance/impedance_model.py

mbtrack2/tracking/wakepotential.py

mbtrack2/utilities/optics.py

pyproject.toml

tests/physics/test_ibs_phys.py

tests/physics/test_lrrw_phys.py

tests/test_imports.py

tests/unit/impedance/test_impedance_model.py

tests/unit/impedance/test_wakefield.py

tests/unit/tracking/test_aperture.py

tests/unit/tracking/test_beam_ion_effects.py

tests/unit/tracking/test_element.py

tests/unit/tracking/test_emfields.py

tests/unit/tracking/test_excite.py

tests/unit/tracking/test_ibs.py

tests/unit/tracking/test_parallel.py

tests/unit/tracking/test_particle.py

tests/unit/tracking/test_rf.py

tests/unit/tracking/test_spacecharge.py