Change Node version back after resetting.

.github/workflows/performance.yml

@@ -71,12 +71,13 @@ jobs:
   # - Run performance tests (current commit).
   # - Print performance tests results.
   # - Check out target commit (target branch or previous commit).
-  # - Switch Node.js versions if different in the target branch.
+  # - Switch Node.js versions if necessary.
   # - Install npm dependencies.
   # - Build WordPress.
   # - Run performance tests (previous/target commit).
   # - Print target performance tests results.
   # - Reset to original commit.
+  # - Switch Node.js versions if necessary.
   # - Install npm dependencies.
   # - Set the environment to the baseline version.
   # - Run baseline performance tests.
@@ -214,6 +215,12 @@ jobs:
       - name: Reset to original commit
         run: git reset --hard $GITHUB_SHA
 
+      - name: Set up Node.js
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d # v3.8.1
+        with:
+          node-version-file: '.nvmrc'
+          cache: npm
+
       - name: Install npm dependencies
         run: npm ci