Use patched version. (#9466)

Due to actions/runner#1605, all our builds are failing.

This changes pins us to machulav/ec2-github-runner#88 until a more stable solution is available.

Either the upstream action merges this in and we bump our version, or Github reverts their breaking change.

Author: davinchia

.github/actions/start-aws-runner/action.yml

@@ -40,7 +40,7 @@ runs:
         aws-region: us-east-2
     - name: Start EC2 runner
       id: start-ec2-runner
-      uses: machulav/ec2-github-runner@v2.3.0
+      uses: skyzh/ec2-github-runner@ba2298a67875dfdd29a88fafbc1ba27f4f94af39
       with:
         mode: start
         github-token: ${{ inputs.github-token }}