Upgrade actions/cache@v4 (#241)

Author: wizz-wallet-dev

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
           python-version: '3.10'
           cache: 'pip'
       - name: Setup Python caches
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ env.pythonLocation }}
           key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py','requirements.txt','requirements-test.txt') }}