No, there are alternative theories to gravity that have been posited..an evolution in thought, if you will...however, gravity itself is still a law.
Laws are formulas depicting a mathematical relationship among measurable phenomena. They are not explanations.
Theories are explanations. Theories never become laws.
Words like evolution, however, can have more than one usage and definition. Evolution can refer to various theories of descent with modification, and it can also refer to the forensically fact of common descent.