chore(actions): update actions/cache action to v3 (#206)

Author: renovate[bot]

.github/workflows/pull_request.yml

@@ -19,7 +19,7 @@ jobs:
 
     - name: Cache pip
       id: cache
-      uses: actions/cache@v3.0.2
+      uses: actions/cache@v3
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}