chore(deps): update dependency django-stubs-ext to v5.2.8 (#3234)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements.txt

@@ -8,7 +8,7 @@ django-countries==8.2.0
 django-macros==0.4.0
 django-markupfield==2.0.1
 django-redis==6.0.0
-django-stubs-ext==5.2.7
+django-stubs-ext==5.2.8
 django-vies==6.2.2
 djangosaml2==1.11.1
 fiobank==4.0.0