Update PHP version with slic

Author: sc0ttkclark

.github/workflows/tests-php.yml

@@ -98,6 +98,7 @@ jobs:
         run: |
           docker network prune -f
           ${SLIC_BIN} use ${GITHUB_REPOSITORY#*/}
+          ${SLIC_BIN} slic php-version 8.0
           ${SLIC_BIN} composer set-version 2
           ${SLIC_BIN} composer install
       # ------------------------------------------------------------------------------