Update build_docs.yml

Author: jonvirak

.github/workflows/build_docs.yml

@@ -18,8 +18,6 @@ jobs:
       - uses: actions/setup-python@v3
       - name: Install python dependencies
         run: |
-          python -m pip install --upgrade pip
-          python -m pip install --upgrade -r requirements.txt
           pip install sphinx sphinx_rtd_theme myst_parser
       - name: Build Sphinx for GitHub Pages
         run: |