Remove PHP 8.0 from CI workflow matrix

Author: bshaffer

.github/workflows/tests.yml

@@ -11,10 +11,10 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: [ "8.0", "8.1", "8.2", "8.3", "8.4" ]
+                php: [ "8.1", "8.2", "8.3", "8.4" ]
                 composer-flags: [""]
                 include:
-                  - php: "8.0"
+                  - php: "8.1"
                     composer-flags: "--prefer-lowest "
                   - php: "8.4"
                     composer-flags: "--prefer-lowest "