CI update actions/checkout

Update actions/checkout to v4

Author: atoomic

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
     container:
       image: perl:${{ matrix.perl-version }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Install Dependencies
         run: |
           perl App-cpanminus/cpanm -nq App::cpanminus