update README.md

Author: kateinoigakukun

README.md

@@ -24,8 +24,8 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-      - uses: actions/checkout@v2
-      - uses: swiftwasm/swiftwasm-action@v5.7
+      - uses: actions/checkout@v3
+      - uses: swiftwasm/swiftwasm-action@v5.8
         with:
           shell-action: carton test
 ```