Upgrade GitHub Actions

.github/workflows/mypy.yml

@@ -1,34 +1,34 b''
 name: Run MyPy
 
 on:
   push:
     branches: [ main, 7.x]
   pull_request:
     branches: [ main, 7.x]
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [3.8]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install mypy pyflakes flake8
     - name: Lint with mypy
       run: |
         mypy -p IPython.terminal
         mypy -p IPython.core.magics
     - name: Lint with pyflakes
       run: |
         flake8  IPython/core/magics/script.py
         flake8  IPython/core/magics/packaging.py