mullvad-browser: 13.0.6 -> 13.0.7

https://github.com/mullvad/mullvad-browser/releases/tag/13.0.7
(cherry picked from commit 9a4106e62ca33c9f6b5c2906300a683a73da5ce6)

pkgs/applications/networking/browsers/mullvad-browser/default.nix

···
       ++ lib.optionals mediaSupport [ ffmpeg ]
   );
 
-  version = "13.0.6";
+  version = "13.0.7";
 
   sources = {
     x86_64-linux = fetchurl {
···
         "https://tor.eff.org/dist/mullvadbrowser/${version}/mullvad-browser-linux-x86_64-${version}.tar.xz"
         "https://tor.calyxinstitute.org/dist/mullvadbrowser/${version}/mullvad-browser-linux-x86_64-${version}.tar.xz"
       ];
-      hash = "sha256-+CLMAXdyqp0HLe68lzp7p54n2HGZQPwZGckwVxOg4Pw=";
+      hash = "sha256-8x0Qa+NasMq1JdrVnCWlCyPb+5UpJXK1VLFoY9lx+8Q=";
     };
   };