TST: Add `npt._GenericAlias` tests for (backported) Python 3.11 features
TST: Add `npt._GenericAlias` tests for (backported) Python 3.11 features

mattip/numpy,anntzer/numpy,mattip/numpy,rgommers/numpy,anntzer/numpy,rgommers/numpy,mattip/numpy,pdebuyl/numpy,endolith/numpy,numpy/numpy,anntzer/numpy,pdebuyl/numpy,mhvk/numpy,charris/numpy,charris/numpy,numpy/numpy,charris/numpy,pdebuyl/numpy,rgommers/numpy,pdebuyl/numpy,mhvk/numpy,mhvk/numpy,charris/numpy,endolith/numpy,mhvk/numpy,mattip/numpy,rgommers/numpy,endolith/numpy,mhvk/numpy,endolith/numpy,numpy/numpy,anntzer/numpy,numpy/numpy