Update benchmark.yml

.github/workflows/benchmark.yml

@@ -2,16 +2,16 @@ name: benchmark
 on:
   workflow_dispatch:
     inputs:
-      ref:
+      sha:
         type: string
         required: true
-        description: "The ref to run the benchmarks against. Defaults to the current commit."
+        description: "The commit SHA to run the benchmarks against."
   push:
     branches: [main]
 
 jobs:
   benchmark:
     uses: vapor/ci/.github/workflows/run-benchmark.yml@mmbm-benchmark-manual
     with:
-      ref: ${{ inputs.ref }}
+      sha: ${{ inputs.sha }}
     secrets: inherit