Merge pull request #2111 from CentreForDigitalHumanities/dependabot/pip/backend/soupsieve-2.8.4

Bump soupsieve from 2.8 to 2.8.4 in /backend

Author: JeltevanBoheemen

backend/requirements.txt

@@ -227,7 +227,7 @@ six==1.17.0
     #   python-dateutil
 smart-open==7.3.1
     # via gensim
-soupsieve==2.8
+soupsieve==2.8.4
     # via beautifulsoup4
 sqlparse==0.5.4
     # via django