Auto merge of #2313 - Turbo87:broken-badge, r=locks
Auto merge of #2313 - Turbo87:broken-badge, r=locks

mirage/fixtures: Remove broken GitLab badge

`huonw/external_mixin` no longer exists on GitLab and leads to a broken badge image

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io