fix install step for pytest workflow

.github/workflows/pytest.yml

@@ -26,18 +26,20 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v5
-      with:
-        python-version: 3.8
-
-        # Used by ci_test.sh
-    - name: Install dependencies
-      run: |
-        python setup.py install
-        pip install pytest
-        pip install solc-select
-    - name: Run Tests
-      run: |
-        pytest tests
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.8
+          cache: "pip"
+          cache-dependency-path: setup.py
+
+
+      - name: Install dependencies
+        run: |
+            pip install ".[test]"
+            solc-select use latest --always-install
+
+      - name: Run Tests
+        run: |
+          pytest tests