Enable Puppet 7 support

To make this work, we also enforce UTF8 for the acceptance tests. The
also voxpupuli/modulesync_config#708

Author: bastelfreak

.github/workflows/ci.yml

@@ -71,5 +71,7 @@ jobs:
       - name: Run tests
         run: bundle exec rake beaker
         env:
+          LANG: en_US
+          LC_ALL: en_US.UTF-8
           BEAKER_PUPPET_COLLECTION: ${{ matrix.puppet.collection }}
           BEAKER_setfile: ${{ matrix.setfile.value }}

metadata.json

@@ -52,7 +52,7 @@
   "requirements": [
     {
       "name": "puppet",
-      "version_requirement": ">= 6.1.0 < 7.0.0"
+      "version_requirement": ">= 6.1.0 < 8.0.0"
     }
   ],
   "operatingsystem_support": [