Added pip caching in workflows

.github/workflows/build_docs.yml

@@ -8,27 +8,25 @@ on:
 jobs:
   update:
     name: Update API docs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
         with:
-          fetch-depth: 0
-      - uses: actions/setup-python@v2
-        with:
-          python-version: 3.x
+          python-version: 3.8
+          cache: 'pip'
       - run: pip install -r requirements.txt
       - run: python3 project_management/generate_api_docs.py
 
   deploy:
     needs: update
     name: Build docs
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
         with:
-          fetch-depth: 0
-      - uses: actions/setup-python@v2
-        with:
-          python-version: 3.x
+          python-version: 3.8
+          cache: 'pip'
       - run: pip install -r project_management/docs-requirements.txt
       - run: mkdocs gh-deploy --force -f project_management/mkdocs.yml

.github/workflows/tests.yml

@@ -18,6 +18,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          cache: 'pip'
       
       - name: Install dependencies
         run: pip install -r requirements.txt