Fix concurrent unfollowing decrementing follower count more than once (#18527)
Fix concurrent unfollowing decrementing follower count more than once (#18527)


Ryanaka/mastodon,pinfort/mastodon,glitch-soc/mastodon,im-in-space/mastodon,tootcafe/mastodon,cobodo/mastodon,musashino205/mastodon,musashino205/mastodon,im-in-space/mastodon,Ryanaka/mastodon,im-in-space/mastodon,koba-lab/mastodon,MitarashiDango/mastodon,MitarashiDango/mastodon,cobodo/mastodon,koba-lab/mastodon,ykzts/mastodon,imas/mastodon,im-in-space/mastodon,pinfort/mastodon,masto-donte-com-br/mastodon,maa123/mastodon,pinfort/mastodon,imas/mastodon,Ryanaka/mastodon,cobodo/mastodon,maa123/mastodon,koba-lab/mastodon,gol-cha/mastodon,imas/mastodon,glitch-soc/mastodon,imas/mastodon,glitch-soc/mastodon,masto-donte-com-br/mastodon,masto-donte-com-br/mastodon,h3zjp/mastodon,tootcafe/mastodon,theoria24/mastodon,maa123/mastodon,h3zjp/mastodon,pinfort/mastodon,h3zjp/mastodon,musashino205/mastodon,yukimochi/mastodon,MitarashiDango/mastodon,theoria24/mastodon,yukimochi/mastodon,theoria24/mastodon,gol-cha/mastodon,ykzts/mastodon,tootcafe/mastodon,gol-cha/mastodon,h3zjp/mastodon,tootcafe/mastodon,glitch-soc/mastodon,cobodo/mastodon,maa123/mastodon,musashino205/mastodon,yukimochi/mastodon,MitarashiDango/mastodon,ykzts/mastodon,yukimochi/mastodon,masto-donte-com-br/mastodon,Ryanaka/mastodon,theoria24/mastodon,ykzts/mastodon,koba-lab/mastodon,gol-cha/mastodon