Update ci.yml

Author: technoluc

.github/workflows/ci.yml

@@ -65,7 +65,7 @@ jobs:
           restore-keys: |
             mkdocs-material-
       - run: pip install \
-             pip install mkdocs-material \
+             mkdocs-material \
              mkdocs-minify-plugin>=0.3 \
              mkdocs-redirects>=1.0 \
              mkdocs-rss-plugin>=0.17 \