update cache version

Author: RedCuckoo

.github/workflows/test.yaml

@@ -15,7 +15,7 @@ jobs:
       #----------------------------------------------
       #        load pip cache if cache exists
       #----------------------------------------------
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip