Dataset of middle cerebral artery blood flow stability in response to high-definition transcranial electrical stimulation - Stefano, Luiz Henrique Soares; Favoretto, Diandra Bosi; Nascimento, Diego Carvalho do; Santos, Luan Rafael Aguiar dos; Bikson, Marom; Leite, João Pereira; Pontes Neto, Octávio Marques; Edwards, Dylan J.; Edwards, Taiza Elaine Grespan Santos (Data in Brief, 2022)