Merge pull request #101 from pytest-dev/setup-python_v2

Switch GitHub actions to setup-python@v2

Author: altendky

.github/workflows/ci.yml

@@ -81,7 +81,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Set up ${{ matrix.python.name }}
         if: ${{ job.container == '' }}
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python.action }}
           architecture: x64
@@ -107,7 +107,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python.dotted }}
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python.dotted }}
           architecture: x64