Update test runner to *run* cargo nextest run

.github/workflows/pull-request.yml

@@ -28,9 +28,12 @@ jobs:
         with:
           toolchain: stable
       
-      - name: Run cargo nextest run
+      - name: Install cargo-nextest
         uses: taiki-e/install-action@nextest
 
+      - name: Run cargo nextest
+        run: cargo nextest run
+
   format:
     name: cargo fmt --all -- --check
     runs-on: ubuntu-latest