Update deploy-docs.yml

.github/workflows/deploy-docs.yml

@@ -12,12 +12,12 @@ jobs:
       - name: Set up Python 3.7
         uses: actions/setup-python@v2
         with:
-          python-version: '3.x'
+          python-version: '3.7'
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          pip install mkdocs-material pydoc-markdown
-          pydoc-markdown --build --site-dir=api
+          python3.7 -m pip install --upgrade pip
+          python3.7 -m pip install mkdocs-material pydoc-markdown
+          python3.7 -m pydoc-markdown --build --site-dir=api
       - name: Copy APi docs
         run: cp -Tavr ./build/docs/content/ ./docs/api/
       - name: Deploy