Externals: Update fmt to 12.2.0

Keeps fmt up to date.

.github/workflows/steamrt4.yml

@@ -43,7 +43,7 @@ jobs:
         distrobox upgrade steamrt4
         distrobox enter --name steamrt4 -- sudo apt-get install -y \
           git cmake ninja-build ccache \
-          lld clang \
+          lld clang clang-tools \
           libclang-dev llvm-dev \
           libstdc++-14-dev-i386-cross libgcc-14-dev-i386-cross \
           libstdc++-14-dev-amd64-cross libgcc-14-dev-amd64-cross