Fix YAML indentation for tags in GitHub Actions workflow

Author: ceelsoin

.github/workflows/tests.yaml

@@ -4,9 +4,9 @@ on:
   push:
     branches:
       - '*'
-      tags:
-      - 'v[0-9].[0-9].[0-9]+'
-      - 'v[0-9].[0-9]+.[0-9]+-beta'
+    tags:
+    - 'v[0-9].[0-9].[0-9]+'
+    - 'v[0-9].[0-9]+.[0-9]+-beta'
     pull_request:
       branches:
       - '*'