Build - use Py3.8

.github/workflows/build.yml

@@ -174,9 +174,14 @@ jobs:
         python-version: [3.8]
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
       - name: Update project version
         run: |
-          git fetch --unshallow
           python update_version_from_git.py
       - name: Build project
         run: |