ci: add 8.0 to deployer matrix (#15)

Author: gaambo

.github/workflows/tests.yml

@@ -19,8 +19,7 @@ jobs:
     strategy:
       matrix:
         php: [ '8.2', '8.3', '8.4', '8.5' ]
-        # TODO: Add 8.0 when released.
-        deployer: [ '7.3', '7.4', '7.5' ]
+        deployer: [ '7.3', '7.4', '7.5', '8.0' ]
       fail-fast: false
     name: Tests for Deployer ${{ matrix.deployer }} on PHP ${{ matrix.php }}