stop testing on perl 5.8 as HTML::Tagset has increased its prereq

Author: haarg

.github/workflows/build-and-test.yml

@@ -37,7 +37,6 @@ jobs:
     strategy:
       matrix:
         perl-version:
-          - "5.8"
           - "5.10"
           - "5.12"
           - "5.14"