ci: fix benchmark-action SHA (use v1.20.7 commit)

Author: Lenvanderhof

.github/workflows/benchmark.yml

@@ -98,7 +98,7 @@ jobs:
         continue-on-error: true
 
       - name: Store benchmark results
-        uses: benchmark-action/github-action-benchmark@cc9ac13ce81cd106a4e7040fc2ab73a38ce02988 # v1
+        uses: benchmark-action/github-action-benchmark@4bdcce38bc94cec68da58d012ac24b7b1155efe8b # v1.20.7
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
         with:
           tool: "cargo"