Restricting benchmarks command

When not specifying the package, the inclusion of paranoid for the
fuzzer target causes it to be added to benchmarks as well. This is what
was causing the slowdown in CI after the last bug fix.

.github/workflows/benches.yml

@@ -14,11 +14,11 @@ jobs:
 
       - name: Build benchmarks
         run: |
-          cargo bench --no-run --features sqlite
+          cargo bench -p benchmarks --no-run --features sqlite
 
       - name: Run benchmarks
         run: |
-          cargo bench --features sqlite
+          cargo bench -p benchmarks --features sqlite
 
       - name: Generate overview
         run: |