test with all recent stable versions of perl.

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   yath:
     strategy:
       matrix:
-        container: [ "perl:5.36", "perl:5.34", "perl:5.32", "perl:5.30" ]
+        container: [ "perl:5.40", "perl:5.38", "perl:5.36", "perl:5.34", "perl:5.32", "perl:5.30" ]
     container:
       image: ${{ matrix.container }}
     runs-on: ubuntu-latest