ci: target x86-64-v3 in benchmarks workflow

Author: xtqqczze

.github/workflows/benchmarks.yml

@@ -23,6 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       CARGO_INCREMENTAL: 0
+      RUSTFLAGS: "-C target-cpu=x86-64-v3"
     strategy:
       matrix:
         type: [simulation, memory]