Add v5.38 to the matrix since v5.40 is not latest

Author: briandfoy

perl-module-ubuntu.yml

@@ -63,6 +63,7 @@ jobs:
                 - '5.32-bullseye'
                 - '5.34-bullseye'
                 - '5.36-bookworm'
+                - '5.38-bookworm'
                 - 'latest'
         container:
             image: perl:${{ matrix.perl-version }}