Benchmark released version of ujson

Author: hugovk

.github/workflows/benchmark.yml

@@ -33,8 +33,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade nujson orjson simplejson
-          python -m pip install .
+          python -m pip install --upgrade nujson orjson simplejson ujson
 
       - name: Tests
         shell: bash