Update linting.yml to try to fix mypy issue

Author: matthewkuner

.github/workflows/linting.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements-dev.txt --quiet
+        pip install -r requirements.txt -r requirements-dev.txt --quiet
     - name: mypy
       run: |
         mypy --namespace-packages --explicit-package-bases pymatgen