Update Github actions to v3 (python#62)

Author: abravalheri

.github/workflows/main.yml

@@ -18,9 +18,9 @@ jobs:
         - windows-latest
     runs-on: ${{ matrix.platform }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python }}
       - name: Install tox
@@ -50,9 +50,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: "3.10"
       - name: Install tox