Upgrade cargo-deny-action to v2

Author: djc

.github/workflows/rust.yml

@@ -48,4 +48,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: EmbarkStudios/cargo-deny-action@v1
+    - uses: EmbarkStudios/cargo-deny-action@v2