added pip cache to CI

.github/workflows/new_tasks.yml

@@ -50,6 +50,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: 3.9
+          cache: 'pip'
       - name: Install dependencies
         if: steps.changed-tasks.outputs.tasks_any_modified == 'true' || steps.changed-tasks.outputs.api_any_modified == 'true'
         run: |

.github/workflows/unit_tests.yml

@@ -26,6 +26,7 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.9
+        cache: 'pip'
     - name: Install dependencies
       run: pip install -e '.[linting,testing]' --extra-index-url https://download.pytorch.org/whl/cpu
     - name: Lint with pylint
@@ -52,6 +53,7 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.9
+        cache: 'pip'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip