Backup blog_previoustagname

Refs:
- simonw/simonwillisonblog#463

.github/workflows/backup.yml

@@ -51,6 +51,7 @@ jobs:
           --table blog_quotation \
           --table blog_quotation_tags \
           --table blog_tag \
+          --table blog_previoustagname \
           --table blog_series \
           --table django_content_type \
           --table redirects_redirect