Stop running CI on 5.8

Looks like HTML-Tagset-3.24 is the culprit

Author: oalders

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

@@ -52,7 +52,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         perl-version:
-          - "5.8"
           - "5.10"
           - "5.12"
           - "5.14"
@@ -69,8 +68,6 @@ jobs:
           - "5.36"
           - "5.38"
         exclude:
-          - os: windows-latest
-            perl-version: "5.8"
           - os: windows-latest
             perl-version: "5.10"
           - os: windows-latest