Update jinja2 requirement from >=3.1.3 to >=3.1.6 in /backend (#4612)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/pyproject.toml

@@ -86,7 +86,7 @@ dependencies = [
     "wagtail-localize==1.13",
     "celery==5.6.3",
     "wagtail-headless-preview==0.8.0",
-    "Jinja2>=3.1.3",
+    "Jinja2>=3.1.6",
     "icalendar>=5.0.11",
     "pyclamd>=0.4.0",
     "magika==0.6.2",