Fix: install requests module

Author: dhruvmanila

.github/workflows/project_euler.yml

@@ -26,10 +26,10 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
-      - name: Install pytest
+      - name: Install pytest and requests
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade pytest
+          python -m pip install --upgrade pytest requests
       - run: pytest scripts/validate_solutions.py
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}