Fixing PHPBench test

Author: moufmouf

.github/workflows/continuous-integration.yml

@@ -350,6 +350,9 @@ jobs:
       - name: "Running PHPBench on current branch"
         run: "./phpbench.dist.sh run --tag=current_pr --store"
 
+      - name: "Reverting any change (that could have been triggered by composer install)"
+        run: "git checkout -- ."
+
       - name: "Switching to master branch"
         run: "git checkout master"