use format_html instead of mark_safe

fet2020/finance/admin.py

@@ -1,7 +1,6 @@
 from django.contrib import admin, messages
 from django.http import HttpResponseRedirect
 from django.utils.html import format_html
-from django.utils.safestring import mark_safe
 from django.utils.translation import ngettext
 from segno import helpers
 
@@ -219,7 +218,7 @@ class BillAdmin(admin.ModelAdmin):
             "F": "green",
             "I": "blue",
         }
-        return mark_safe(
+        return format_html(
             f'<b style="background:{colors[obj.status]};">{obj.get_status_display()}</b>'
         )