correct YAML formatting

Author: dlandau

.github/workflows/moodle-ci.yml

@@ -33,7 +33,7 @@ jobs:
         php: ['8.2']
         moodle-branch: ['MOODLE_405_STABLE','MOODLE_500_STABLE','MOODLE_501_STABLE','main']
         database: [pgsql, mariadb]
-	exclude:
+        exclude:
           - {moodle-branch: 'MOODLE_405_STABLE', php: '8.4', database: 'pgsql'}
           - {moodle-branch: 'MOODLE_405_STABLE', php: '8.4', database: 'mariadb'}
           - {moodle-branch: 'MOODLE_500_STABLE', php: '8.1', database: 'pgsql'}