Use new FIZZY_GH_TOKEN with limited access

because this is a public repo and so doesn't have access to the
private org secret GH_TOKEN anymore.

.github/workflows/test.yml

@@ -7,7 +7,7 @@ on:
         type: boolean
         required: true
     secrets:
-      GH_TOKEN:
+      FIZZY_GH_TOKEN:
         required: false
 
 permissions:
@@ -50,7 +50,7 @@ jobs:
       MYSQL_USER: root
       FIZZY_DB_HOST: 127.0.0.1
       FIZZY_DB_PORT: 3306
-      BUNDLE_GITHUB__COM: ${{ inputs.saas && format('x-access-token:{0}', secrets.GH_TOKEN) || '' }}
+      BUNDLE_GITHUB__COM: ${{ inputs.saas && format('x-access-token:{0}', secrets.FIZZY_GH_TOKEN) || '' }}
 
     steps:
       - name: Install system packages