message: ci: fix shebang in ci-benchmark.sh
diff: +#!/usr/bin/env sh
  +
  # Fizzy: A fast WebAssembly interpreter
  # Copyright 2019-2020 The Fizzy Authors.
  # SPDX-License-Identifier: Apache-2.0
  -#!/usr/bin/env sh
  -
  if [ -z "$CIRCLECI_TOKEN" ]; then
  echo "CIRCLECI_TOKEN env var is required"
  exit 1
  