Change job for latest php

.github/workflows/test.yml

@@ -32,10 +32,10 @@ jobs:
       - name: Show PHP version
         run: php -v
 
-  test-latest:
+  test-81:
     runs-on: ubuntu-latest
     container:
-      image: cicnavi/dap:08
+      image: cicnavi/dap:81
     steps:
       - uses: actions/checkout@v3
       - name: Validate composer.json and composer.lock