Update python.yml

Changed from actions/checkout@v2 to actions/checkout@v3 because of error
> build (3.8)
Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: actions/checkout@v2, actions/setup-python@v2. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

.github/workflows/python.yml

@@ -14,9 +14,9 @@ jobs:
       GBIF_PWD: ${{ secrets.GBIF_PWD }}
       GBIF_EMAIL: ${{ secrets.GBIF_EMAIL }}
     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@v3
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install system dependencies