avoid spurious duplicate dependencies erorr

.github/workflows/cargo-deny.yml

@@ -34,6 +34,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+
+      # Avoid spurious reports of duplicated dependencies by using precise versions of some crates
+      # In particular: avoid syn 2.0 until all crates are updated
+      - name: Set up package versions
+        run: |
+          cargo update --package async-trait --precise 0.1.66
+          cargo update --package serde --precise 1.0.156
+          cargo update --package serde_repr --precise 0.1.11
+
       - uses: EmbarkStudios/cargo-deny-action@v1
         with:
           log-level: error