Refactor GitHub Actions workflow to combine dependency installation and testing steps

Author: Vianpyro

.github/workflows/pytest.yml

@@ -25,8 +25,11 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'pip'
-      run: pip install -r requirements.txt
-      run: pip test
+
+    - name: Install dependencies
+      run: |
+        pip install -r requirements.txt
+        pip test
 
     - name: Test with pytest
       run: |