Update dependency django-debug-toolbar to v4.2.0

This MR contains the following updates:

Package	Update	Change
django-debug-toolbar (changelog)	minor	==4.1.0 -> ==4.2.0

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Release Notes

jazzband/django-debug-toolbar (django-debug-toolbar)

v4.2.0

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requirements.txt

@@ -7,7 +7,7 @@ django-timezone-field==5.1
 djangorestframework==3.14.0
 django-simple-history==3.3.0
 django-registration-redux==2.12
-django-debug-toolbar==4.1.0
+django-debug-toolbar==4.2.0
 django-bootstrap-datepicker-plus==5.0.4
 django-tex==1.1.10
 django-csp==3.7