Update rust.yml

Finally read the part that says "this is deprecated use the thing GitHub has built in"

frik

.github/workflows/rust.yml

@@ -17,8 +17,8 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
-    - name: Checkout submodules
-      uses: textbook/git-checkout-submodule-action@v2.1.1
+      with:
+        submodules: recursive
     - name: Build
       run: cargo build --verbose
     - name: Run tests