Update GitHub Actions

* Bump versions of all imported actions
* Cache Python packages
* Do not upgrade pip

.github/workflows/python.yml

@@ -10,20 +10,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
+      - name: Install Poetry
+        run: pip install poetry==1.2.0b1
       - name: Install Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          cache: poetry
       - name: Install environment
-        run: |
-          python -m pip install --upgrade pip
-          pip install poetry==1.2.0b1
-          poetry install
+        run: poetry install
       - name: Test with nox
         run: poetry run nox -s test-${{ matrix.python-version }}
       - name: Store coverage
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: coverage
           path: .coverage.*
@@ -32,37 +32,37 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
+      - name: Install Poetry
+        run: pip install poetry==1.2.0b1
       - name: Install Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9
+          cache: poetry
       - name: Install environment
-        run: |
-          python -m pip install --upgrade pip
-          pip install poetry==1.2.0b1
-          poetry install
+        run: poetry install
       - name: Fetch coverage
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: coverage
       - name: Combine coverage and generate report
         run: poetry run nox -s coverage
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3
   quality:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
+      - name: Install Poetry
+        run: pip install poetry==1.2.0b1
       - name: Install Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9
+          cache: poetry
       - name: Install environment
-        run: |
-          python -m pip install --upgrade pip
-          pip install poetry==1.2.0b1
-          poetry install
+        run: poetry install
       - name: Run code quality checks
         run: poetry run nox -s black isort lint