[Backport release-23.11] mastodon: 4.2.4 -> 4.2.5

[github-actions]

Bot-based backport to release-23.11, triggered by a label in #285558.

• Before merging, ensure that this backport is acceptable for the release.
  • Even as a non-commiter, if you find that it is not acceptable, leave a comment.

[erictapen]

@GrahamcOfBorg test mastodon

[rgrunbla]

While waiting for the channels to catch up, it's possible to use this overlay to have the security fix ready asap :

nixpkgs.overlays = [
  (final: prev:
     rec {
       mastodon = prev.mastodon.override {
         version = "4.2.5";
         patches = [
           (final.fetchpatch {
             url = "https://github.com/mastodon/mastodon/compare/v4.2.4...v4.2.5.patch";
             hash = "sha256-CtzYV1i34s33lV/1jeNcr9p/x4Es1zRaf4l1sNWVKYk=";
           })
         ];
       };
     })
 ];