By Andrew Holleran Colin Kaepernick hasn’t played in the National Football League since 2016. The former San Francisco 49ers quarterback is reportedly in the best shape of his life, though, and has interest in returning to the league. ESPN’s Adam Schefter shared the latest. “Colin Kaepernick is still working out and is said to be, in the words of one source, “in the best shape of his life. He wants to play. He’s ready play. He would be a great fit for teams with QB vacancies to fill who want to win a Super Bowl,’” he tweeted. Don’t count on it happening, though. Pro Football Talk’s Mike Florio…