Add caching for python dependencies in ci.yml

.github/workflows/ci.yml

@@ -25,6 +25,15 @@ jobs:
         with:
           python-version: "3.11"
 
+      - name: Cache Python dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/pip
+            !~/.cache/pip/log
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip