Less than a day after Amber Heard gave formal notice of her intent to appeal the verdict in Johnny Depp’s defamation trial against her, the Aquaman star’s ex-husband has launched his own countermove. In paperwork filed this morning in Fairfax County, the former Pirates of the Caribbean actor has put his legal players on the board. “Plaintiff and Counterclaim-Defendant John C. Depp, II, by counsel, hereby …