use pip3 instance pip

Author: datamweb

.github/workflows/docs.yml

@@ -13,6 +13,6 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x
-      - run: pip install mkdocs-material
-      - run: pip install mkdocs-git-revision-date-localized-plugin
+      - run: pip3 install mkdocs-material
+      - run: pip3 install mkdocs-git-revision-date-localized-plugin
       - run: mkdocs gh-deploy --force