Fix workflow

Author: ondrejmirtes

.github/workflows/bench.yml

@@ -83,4 +83,4 @@ jobs:
       - uses: "ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520" # v3
 
       - name: "Run phpbench test"
-        run: "vendor/bin/phpbench run --file=tests/bench/storage/baseline.xml --ref=baseline --report=aggregate --assert=\"variant.mode <= baseline.mode +/- 5%\""
+        run: "vendor/bin/phpbench run --file=tests/bench/storage/baseline.xml --ref=baseline --report=aggregate --assert=\"mode(variant.time.avg) < mode(baseline.time.avg) +/- 10%\""