[0.7] pin machulav/ec2-github-runner version - bm flow (#900)

pin version

Author: meiravgri

.github/workflows/benchmark.yml

@@ -21,7 +21,7 @@ jobs:
           aws-region: ${{ secrets.AWS_REGION }}
       - name: Start EC2 runner
         id: start-ec2-runner
-        uses: machulav/ec2-github-runner@v2
+        uses: machulav/ec2-github-runner@v2.4.2
         with:
           mode: start
           github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
@@ -101,7 +101,7 @@ jobs:
           aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
           aws-region: ${{ secrets.AWS_REGION }}
       - name: Stop EC2 runner
-        uses: machulav/ec2-github-runner@v2
+        uses: machulav/ec2-github-runner@v2.4.2
         with:
           mode: stop
           github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}