Upgrade GitHub Actions

.github/workflows/pythontest.yml

@@ -17,9 +17,9 @@ jobs:
       fail-fast: false
 
     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 native dependencies (Ubuntu)
@@ -31,17 +31,17 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -U ".[fastimport,paramiko,https]"
+          pip install --upgrade ".[fastimport,paramiko,https]"
       - name: Install gpg on supported platforms
-        run: pip install -U ".[pgp]"
+        run: pip install --upgrade ".[pgp]"
         if: "matrix.os != 'windows-latest' && matrix.python-version != 'pypy3'"
       - name: Style checks
         run: |
-          pip install -U flake8
+          pip install --upgrade flake8
           python -m flake8
       - name: Typing checks
         run: |
-          pip install -U mypy types-paramiko types-requests
+          pip install --upgrade mypy types-paramiko types-requests
           python -m mypy dulwich
         if: "matrix.python-version != 'pypy3'"
       - name: Build
@@ -49,5 +49,5 @@ jobs:
           python setup.py build_ext -i
       - name: Coverage test suite run
         run: |
-          pip install -U coverage
+          pip install --upgrade coverage
           python -m coverage run -p -m unittest dulwich.tests.test_suite