message: fix: use `master` over `main` for benchmark step
  Replaces `main` with `master` when filtering the Update Benchmarks job
  execution.
diff: @@ -46,7 +46,7 @@ jobs:
  - name: Store benchmark result
  uses: benchmark-action/github-action-benchmark@v1
  - if: github.ref == 'refs/heads/main'
  + if: github.ref == 'refs/heads/master'
  with:
  # What benchmark tool the output.txt came from
  tool: 'cargo'
  