Update linting workflow.

.github/workflows/linting.yml

@@ -11,7 +11,7 @@ jobs:
         python-version: [3.11]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up Python ${{ matrix.python-version }}
@@ -21,7 +21,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -r requirements-ci.txt --quiet
+          pip install --upgrade -r requirements-ci.txt --quiet
       - name: mypy
         run: |
           mypy --namespace-packages --explicit-package-bases pymatgen