[CI/CD] Use long format command option flags

Author: gkaf89

.github/workflows/deploy.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -r requirements.txt
+          pip install --requirement requirements.txt
           mkdocs --version
       - name: build ULHPC documentation
         run: mkdocs build && mkdocs gh-deploy --force

.github/workflows/test-build.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -r requirements.txt
+          pip install --requirement requirements.txt
           mkdocs --version
       - name: build ULHPC documentation
         run: mkdocs build