Fix cuda toolkit installation in CI (Rust-GPU#147)

Author: LegNeato

Diff for: .github/workflows/rust.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Install CUDA 
-        uses: Jimver/cuda-toolkit@v0.2.4
+        uses: Jimver/cuda-toolkit@v0.2.21
         id: cuda-toolkit
         with:
           cuda: '11.2.2'
@@ -74,4 +74,4 @@ jobs:
       - name: Check documentation
         env:
           RUSTDOCFLAGS: -Dwarnings
-        run: cargo doc --workspace --all-features --document-private-items --no-deps --exclude "optix" --exclude "path_tracer" --exclude "denoiser" --exclude "add" --exclude "ex*"
+        run: cargo doc --workspace --all-features --document-private-items --no-deps --exclude "optix" --exclude "path_tracer" --exclude "denoiser" --exclude "add" --exclude "ex*"