ci: update EmbarkStudios/cargo-deny-action to v2.

Author: eddyb

.github/workflows/ci.yaml

@@ -160,4 +160,4 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-      - uses: EmbarkStudios/cargo-deny-action@v1
+      - uses: EmbarkStudios/cargo-deny-action@v2