Use new deadcode linter in ci

Author: arbulu89

.github/workflows/ci.yaml

@@ -50,6 +50,10 @@ jobs:
           version: v2.4.0
           skip-cache: true
           args: "--timeout=3m"
+      - name: deadcode
+        run: |
+          go install golang.org/x/tools/cmd/deadcode@latest
+          make deadcode
 
   test-with-go:
     runs-on: ubuntu-24.04