Update cache action to v3

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
           echo "::set-output name=dir::$(pip cache dir)"
 
       - name: Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: