main/tmux: upgrade to 3.1c

main/tmux/APKBUILD

 # Contributor: Natanael Copa <ncopa@alpinelinux.org>
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=tmux
-pkgver=3.1b
+pkgver=3.1c
 pkgrel=0
 pkgdesc="Tool to control multiple terminals from a single terminal"
 url="https://tmux.github.io"
@@ -38,4 +38,4 @@ package() {
 	done
 }
 
-sha512sums="fd5269f5f58ad20c35ece24af74035e622e16511baa331717bded5edcbfd46c1847fd86c02431a7d889ce7d5bec89c8177a680ca60e9ca821f13065d26ca7fa1  tmux-3.1b.tar.gz"
+sha512sums="aad2e6457dd350369f245f711f1936a575d0588b72e660d10e7abc7d373da0d322903b451ad00b96a3e0e6847ca855673da6a4c5447cea91fa756edd23659397  tmux-3.1c.tar.gz"