Update pull_request_tests.yml

.github/workflows/pull_request_tests.yml

@@ -1,6 +1,6 @@
 name: Pytests
 
-on: 
+on:
   pull_request:
   workflow_dispatch:
 
@@ -17,25 +17,24 @@ jobs:
             python-version: '3.10'
           - os: ubuntu-latest
             python-version: '3.9'
+          - os: ubuntu-latest
+            python-version: '3.8'
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.event.pull_request.head.ref }}
         fetch-depth: 0
         fetch-tags: true
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Install nsrdb dependencies
+        cache: 'pip'
+    - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        conda install hdf4
-        python -m pip install pyhdf
-        python -m pip install pytest
-        python -m pip install pytest-cov
-        python -m pip install .
+        python -m pip install .[test]
     - name: Run pytest
       run: |
         python -m pytest -v --disable-warnings