After postponing  her “Dolly: Live in Las Vegas” residency late last year, country icon Dolly Parton has officially canceled her scheduled concerts at The Colosseum at Caesars Palace. In addition to the announcement, Parton took to social media to give fans more information on her health, as well as a few life (and career) updates. “I have some good news and a little bad news,” she said at the top of the video. “But the good news is I’m responding really well to meds and treatments, and I’m improving every day. Now, the bad news is it’s gonna take me a little while before I’m up to stage performance level, because some of the meds and treatments make me a little bit ‘swimmy-headed,’ as my grandma used to say.” “I am truly sorry that I’m going to miss all of you that had tickets to see me in Las Vegas,” she added, addressing the canceled shows.…