fix: other cache version

Author: gadomski

.github/workflows/continuous-integration.yml

@@ -38,7 +38,7 @@ jobs:
           key: ${{ runner.os }}-conda-${{ hashFiles('**/environment.yml') }}
           restore-keys: ${{ runner.os }}-conda-
       - name: Set up pip cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.cfg', '**/requirements-dev.txt') }}