Merge pull request #2072 from ccnmtl/dependabot/pip/django-s3sign-lte…

…-0.5.1

Update django-s3sign requirement from <=0.4.0 to ==0.5.1

requirements.txt

@@ -104,7 +104,7 @@ django-cogwheels==0.3
 webencodings==0.5.1 # needed for wagtail
 urllib3==2.2.2 # wagtail elasticsearch backend
 
-django-s3sign<=0.4.0
+django-s3sign==0.5.1
 ctlsettings==0.4.3
 text_unidecode==1.3