ci: cache pip dependencies

.github/workflows/pytest-multiversion.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
 
-name: Python package
+name: Test on multiple Python versions
 
 on:
   push:
@@ -23,6 +23,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          cache: "pip" # caching pip dependencies
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip

.github/workflows/python-publish.yml

@@ -26,6 +26,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: "3.x"
+          cache: "pip" # caching pip dependencies
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip