Switch to actions/checkout@v3

.github/workflows/perl_linux.yml

@@ -28,7 +28,7 @@ jobs:
       image: perl:${{ matrix.perl-version }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: perl -V
         run: perl -V
       - name: Install Dependencies