Did this fix the issue?

Author: MarkusPettersson98

.github/workflows/rust-unused-dependencies.yml

@@ -44,7 +44,8 @@ jobs:
       - name: Checkout submodules
         run: |
           git config --global --add safe.directory '*'
-          git submodule update --init --depth=1 dist-assets/binaries wireguard-go-rs
+          git submodule update --init --depth=1 dist-assets/binaries
+          git submodule update --init --recursive --depth=1 wireguard-go-rs
 
       - name: Install nightly Rust toolchain
         run: rustup default $RUST_NIGHTLY_TOOLCHAIN